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un-failing
adjective as in infallible
Strongest matches
Weak matches
adjective as in invariable
adjective as in loyal
adjective as in perennial
Strongest matches
adjective as in perpetual
Strongest matches
adjective as in reliable
Strongest matches
Weak matches
- candid
- careful
- certain
- come-through
- conscientious
- constant
- definite
- determined
- devoted
- faithful
- firm
- high-principled
- honorable
- impeccable
- incorrupt
- loyal
- okay
- proved
- reputable
- responsible
- righteous
- sound
- staunch
- steadfast
- sterling
- sure
- there
- tried
- tried-and-true
- true-blue
- true-hearted
- trusty
- unequivocal
- unfailing
- unimpeachable
- upright
- veracious
adjective as in same
Strong matches
adjective as in sure
Weak matches
- abiding
- changeless
- constant
- convincing
- decided
- doubtless
- enduring
- firm
- fixed
- for a fact
- free from doubt
- genuine
- incontestable
- incontrovertible
- indisputable
- indubitable
- never-failing
- persuaded
- real
- satisfied
- set
- steadfast
- steady
- telling
- unchangeable
- unchanging
- uncompromising
- undeniable
- unequivocal
- unfailing
- unfaltering
- unqualified
- unquestionable
- unquestioning
- unshakable
- unshaken
- unvarying
- unwavering
- valid
adjective as in sure
adjective as in trustworthy/trusty
Weak matches
- accurate
- always there
- authentic
- authoritative
- convincing
- credible
- dependable
- ethical
- exact
- honest
- honorable
- kosher
- levelheaded
- mature
- on the level
- on the up and up
- open
- plausible
- principled
- realistic
- responsible
- righteous
- rock solid
- saintly
- secure
- sensible
- solid
- square
- steadfast
- straight
- there
- to be trusted
- tried
- tried-and-true
- true
- true-blue
- trustable
- truthful
- unfailing
- up-front
- upright
- valid
- veracious
adjective as in unchanging
adjective as in unerring
adjective as in unfailing
Strongest matches
Weak matches
- absolute
- assiduous
- ceaseless
- come-through
- consistent
- constant
- continual
- continuing
- continuous
- counted-on
- delivering
- dependable
- diligent
- dyed-in-the-wool
- endless
- faithful
- infallible
- invariable
- loyal
- never-failing
- persistent
- reliable
- rock solid
- same
- solid
- staunch
- straight
- sure
- surefire
- there
- tried-and-true
- true
- trustworthy
- unlimited
- unrelenting
adjective as in unfaltering
Weak matches
- abiding
- bent on
- bound
- bound and determined
- dead set on
- enduring
- firm
- going all the way
- indefatigable
- meaning business
- mulish
- never-failing
- persevering
- pigheaded
- resolute
- set
- steady
- stiff-necked
- stubborn
- sure
- tireless
- unfailing
- unflagging
- unflappable
- unflinching
- unqualified
- unquestioning
- unswerving
- untiring
- unwavering
- wholehearted
adjective as in unflagging
adjective as in untiring
Weak matches
- constant
- continued
- continuing
- dedicated
- devoted
- dogged
- eager beaver
- fireball
- firm
- go-go
- grind
- hyper
- incessant
- indefatigable
- indomitable
- inexhaustible
- jumping
- patient
- perky
- persistent
- pertinacious
- plodding
- plugging
- resolute
- staunch
- steady
- strong
- tenacious
- tireless
- unceasing
- undeterred
- unfailing
- unfaltering
- unflagging
- unflinching
- unremitting
- unstinted
- unswerving
- unwavering
- unwearied
adjective as in trustworthy
Strongest matches
Strong match
adjective as in round-the-clock
Strongest matches
adjective as in undoubting
Weak matches
- abiding
- assured
- certain
- changeless
- clear
- confident
- constant
- convinced
- convincing
- decided
- doubtless
- enduring
- firm
- fixed
- for a fact
- free from doubt
- genuine
- incontestable
- incontrovertible
- indisputable
- indubitable
- never-failing
- persuaded
- positive
- real
- satisfied
- set
- steadfast
- steady
- telling
- unchangeable
- unchanging
- uncompromising
- undeniable
- unequivocal
- unfailing
- unfaltering
- unqualified
- unquestionable
- unquestioning
- unshakable
- unshaken
- unvarying
- unwavering
- valid
adjective as in unremitting
Strongest matches
adjective as in unwearied
adjective as in weariless
adjective as in consistent
adjective as in constant
adjective as in continual
Strongest matches
adjective as in dependable
adjective as in foolproof
Strongest matches
Strong matches
adjective as in infallible
Strongest matches
Weak matches
adjective as in invariable
adjective as in loyal
adjective as in perennial
Strongest matches
adjective as in perpetual
Strongest matches
adjective as in reliable
Strongest matches
Weak matches
- candid
- careful
- certain
- come-through
- conscientious
- constant
- definite
- determined
- devoted
- faithful
- firm
- high-principled
- honorable
- impeccable
- incorrupt
- loyal
- okay
- proved
- reputable
- responsible
- righteous
- sound
- staunch
- steadfast
- sterling
- sure
- there
- tried
- tried-and-true
- true-blue
- true-hearted
- trusty
- unequivocal
- unfailing
- unimpeachable
- upright
- veracious
adjective as in same
Strong matches
adjective as in sure
Weak matches
- abiding
- changeless
- constant
- convincing
- decided
- doubtless
- enduring
- firm
- fixed
- for a fact
- free from doubt
- genuine
- incontestable
- incontrovertible
- indisputable
- indubitable
- never-failing
- persuaded
- real
- satisfied
- set
- steadfast
- steady
- telling
- unchangeable
- unchanging
- uncompromising
- undeniable
- unequivocal
- unfailing
- unfaltering
- unqualified
- unquestionable
- unquestioning
- unshakable
- unshaken
- unvarying
- unwavering
- valid
adjective as in sure
adjective as in trustworthy/trusty
Weak matches
- accurate
- always there
- authentic
- authoritative
- convincing
- credible
- dependable
- ethical
- exact
- honest
- honorable
- kosher
- levelheaded
- mature
- on the level
- on the up and up
- open
- plausible
- principled
- realistic
- responsible
- righteous
- rock solid
- saintly
- secure
- sensible
- solid
- square
- steadfast
- straight
- there
- to be trusted
- tried
- tried-and-true
- true
- true-blue
- trustable
- truthful
- unfailing
- up-front
- upright
- valid
- veracious
adjective as in unchanging
adjective as in unerring
adjective as in unfailing
Strongest matches
Weak matches
- absolute
- assiduous
- ceaseless
- come-through
- consistent
- constant
- continual
- continuing
- continuous
- counted-on
- delivering
- dependable
- diligent
- dyed-in-the-wool
- endless
- faithful
- infallible
- invariable
- loyal
- never-failing
- persistent
- reliable
- rock solid
- same
- solid
- staunch
- straight
- sure
- surefire
- there
- tried-and-true
- true
- trustworthy
- unlimited
- unrelenting
adjective as in unfaltering
Weak matches
- abiding
- bent on
- bound
- bound and determined
- dead set on
- enduring
- firm
- going all the way
- indefatigable
- meaning business
- mulish
- never-failing
- persevering
- pigheaded
- resolute
- set
- steady
- stiff-necked
- stubborn
- sure
- tireless
- unfailing
- unflagging
- unflappable
- unflinching
- unqualified
- unquestioning
- unswerving
- untiring
- unwavering
- wholehearted
adjective as in unflagging
adjective as in untiring
Weak matches
- constant
- continued
- continuing
- dedicated
- devoted
- dogged
- eager beaver
- fireball
- firm
- go-go
- grind
- hyper
- incessant
- indefatigable
- indomitable
- inexhaustible
- jumping
- patient
- perky
- persistent
- pertinacious
- plodding
- plugging
- resolute
- staunch
- steady
- strong
- tenacious
- tireless
- unceasing
- undeterred
- unfailing
- unfaltering
- unflagging
- unflinching
- unremitting
- unstinted
- unswerving
- unwavering
- unwearied
adjective as in trustworthy
Strongest matches
Strong match
adjective as in round-the-clock
Strongest matches
adjective as in undoubting
Weak matches
- abiding
- assured
- certain
- changeless
- clear
- confident
- constant
- convinced
- convincing
- decided
- doubtless
- enduring
- firm
- fixed
- for a fact
- free from doubt
- genuine
- incontestable
- incontrovertible
- indisputable
- indubitable
- never-failing
- persuaded
- positive
- real
- satisfied
- set
- steadfast
- steady
- telling
- unchangeable
- unchanging
- uncompromising
- undeniable
- unequivocal
- unfailing
- unfaltering
- unqualified
- unquestionable
- unquestioning
- unshakable
- unshaken
- unvarying
- unwavering
- valid
adjective as in unremitting
Strongest matches
adjective as in unwearied
adjective as in weariless
adjective as in consistent
adjective as in constant
adjective as in continual
Strongest matches
adjective as in dependable
adjective as in foolproof
Strongest matches
Strong matches
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Synonym of the day
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On this page you'll find 1112 synonyms, antonyms, and words related to un failing, such as: authoritative, flawless, foolproof, unbeatable, acceptable, and accurate.
From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.
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