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Synonyms for infallible
adj unerring, dependable- authoritative
- flawless
- foolproof
- unbeatable
- acceptable
- accurate
- agreeable
- apodictic
- certain
- correct
- effective
- effectual
- efficacious
- efficient
- exact
- faultless
- handy
- helpful
- impeccable
- incontrovertible
- inerrable
- inerrant
- omniscient
- perfect
- positive
- reliable
- satisfactory
- satisfying
- sure
- surefire
- true
- trustworthy
- undeceivable
- unfailing
- unimpeachable
- unquestionable
- useful
Antonyms for infallible
Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the
Philip Lief Group.
accurate
adjective. correct, without error
certain
adjective. undoubtable, valid
- absolute
- ascertained
- authoritative
- clear
- conclusive
- confirmable
- definite
- demonstrable
- destined
- determined
- establishable
- evident
- firm
- fixed
- genuine
- guaranteed
- having down pat
- in the bag
- incontrovertible
- indubitable
- infallible
- irrefutable
- known
- on ice
- plain
- positive
- predestined
- provable
- real
- reliable
- safe
- salted away
- set
- sound
- supreme
- sure
- sure thing
- true
- trustworthy
- unambiguous
- undeniable
- undoubted
- unequivocal
- unerring
- unmistakable
- verifiable
impeccable
adjective. above suspicion; flawless
inarguable
adjective. certain
- absolute
- ascertained
- authoritative
- clear
- conclusive
- confirmable
- definite
- demonstrable
- destined
- determined
- establishable
- evident
- firm
- fixed
- genuine
- guaranteed
- hard
- having down pat
- in the bag
- incontestable
- incontrovertible
- indisputable
- indubitable
- infallible
- irrefutable
- known
- on ice
- plain
- positive
- predestined
- provable
- real
- reliable
- safe
- salted away
- set
- sound
- supreme
- sure
- sure thing
- true
- trustworthy
- unambiguous
- unassailable
- undeniable
- undisputable
- undoubted
- unequivocal
- unerring
- unmistakable
- unquestionable
- verifiable
incontestable
adjective. certain
- absolute
- ascertained
- authoritative
- clear
- conclusive
- confirmable
- definite
- demonstrable
- destined
- determined
- establishable
- evident
- firm
- fixed
- genuine
- guaranteed
- hard
- having down pat
- in the bag
- inarguable
- incontrovertible
- indisputable
- indubitable
- infallible
- irrefutable
- known
- on ice
- plain
- positive
- predestined
- provable
- real
- reliable
- safe
- salted away
- set
- sound
- supreme
- sure
- sure thing
- true
- trustworthy
- unambiguous
- unassailable
- undeniable
- undisputable
- undoubted
- unequivocal
- unerring
- unmistakable
- unquestionable
- verifiable
Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the
Philip Lief Group.