Definitions

without fail

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assuredly adv.
certainly adv.
definitely adv.
necessarily adv.
OK adv.
right on adv.
roger adv.
surely adv.
uh-huh adv.
yes adv.

ADVERB

assuredly

Synonyms

STRONGEST

undoubtedly

WEAK

absolutely certainly definitely of course positively surely unquestionably

Antonyms

WEAK

doubtfully questionably

ADVERB

certainly

Synonyms

STRONGEST

absolutely assuredly exactly surely

WEAK

cert for a fact of course positively posolutely right on unquestionably

Antonyms

STRONGEST

doubtfully questionably

WEAK

dubiously equivocally

ADVERB

definitely

Synonyms

STRONGEST

absolutely clearly decidedly doubtless easily finally obviously plainly surely undeniably unequivocally unquestionably

WEAK

beyond any doubt categorically doubtlessly explicitly expressly far and away indubitably no ifs ands or buts about it positively specifically unmistakably without doubt without question

Antonyms

STRONGEST

doubtedly doubtfully dubiously questionable questionably uncertain

WEAK

indefinitely

ADVERB

necessarily

Synonyms

STRONGEST

automatically naturally no doubt undoubtedly unquestionably

WEAK

accordingly as a matter of course axiomatically beyond one's control by definition by its own nature cardinally come what may compulsorily consequently exigently from within fundamentally incontrovertibly indubitably ineluctably inescapably inexorably irresistibly of course of necessity perforce positively pressingly significantly unpreventably vitally willy-nilly

Antonyms

STRONGEST

doubtfully questionably

WEAK

unnecessarily

ADVERB

Synonyms

STRONGEST

fine okay

STRONG

affirmative amen good true yea

WEAK

absolutely agreed all right assuredly aye beyond a doubt by all means certainly definitely even so exactly gladly good enough granted indubitably just so most assuredly naturally of course positively precisely roger sure thing surely undoubtedly unquestionably very well willingly yep

ADVERB

right on

Synonyms

WEAK

absolutely affirmative agreed all right amen assuredly aye beyond a doubt by all means certainly definitely even so exactly fine gladly good good enough granted indubitably just so most assuredly naturally of course okay positively precisely roger sure thing surely true undoubtedly unquestionably very well willingly yea yep

ADVERB

roger

Synonyms

WEAK

absolutely affirmative agreed all right amen assuredly aye beyond a doubt by all means certainly definitely even so exactly fine gladly good good enough granted indubitably just so most assuredly naturally of course okay positively precisely sure thing surely true undoubtedly unquestionably very well willingly yea yep

ADVERB

surely

Synonyms

STRONGEST

absolutely assuredly certainly clearly definitely evidently indeed inevitably inexorably plainly undoubtedly unquestionably

WEAK

admittedly beyond doubt beyond shadow of doubt come what may conclusively decidedly distinctly doubtlessly explicitly fixedly for certain indubitably infallibly irrefutably manifestly nothing else but positively rain or shine to be sure unequivocally unerringly unfailingly unmistakably unshakably with certainty

Antonyms

STRONGEST

doubtfully dubiously indefinite indefinitely questionably vaguely

WEAK

uncertain

ADVERB

uh-huh

Synonyms

WEAK

ADVERB

yes

Synonyms

STRONG

affirmative amen fine good okay true yea

WEAK

all right aye beyond a doubt by all means certainly definitely even so exactly gladly good enough granted indubitably just so most assuredly naturally of course positively precisely sure thing surely undoubtedly unquestionably very well willingly yep

Antonyms

WEAK

disagreed

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

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without fail

Her friends said she "lit up every room she walked into and put a smile on everyone's face without fail".

From BBC ● Jul. 21, 2026

"The policy of continuously strengthening the country's self-defensive nuclear deterrent, as set out by the nation's leader, is an irreversible course that must be implemented without fail," she added.

From Barron's ● Jun. 7, 2026

“When a new person asked me what the best Mexican restaurant in New York was, my response, without fail, was “I’m still looking for it.”

From Salon ● Jun. 3, 2026

And, without fail, the player they nicknamed “Captain Clutch” delivered.

From The Wall Street Journal ● May 20, 2026

The paper was frayed and nearly falling apart because every night, without fail, Pili would read to her little brother.

From "The Way to Rio Luna" by Zoraida Cordova

without fail

Example Sentences

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