Definitions

undeniably

ADVERB

beyond a shadow of a doubt

Synonyms

WEAK

absolutely beyond a doubt beyond any doubt beyond doubt categorically certainly clearly definitely indubitably no ifs ands or buts about it obviously unquestionably

ADVERB

clearly

Synonyms

STRONGEST

apparently certainly definitely distinctly evidently obviously openly plainly positively precisely seemingly surely undoubtedly

WEAK

acutely audibly beyond doubt conspicuously decidedly discernibly incontestably incontrovertibly indubitably lucidly manifestly markedly noticeably overtly patently penetratingly perceptibly prominently purely recognizably sharply sonorously translucently transparently unmistakably

Antonyms

STRONGEST

doubtfully dubiously equivocally questionably uncertain

WEAK

indefinitely indistinctly mysteriously vaguely

ADVERB

definitely

Synonyms

STRONGEST

absolutely clearly decidedly doubtless easily finally obviously plainly surely 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 fail without question

Antonyms

STRONGEST

doubtedly doubtfully dubiously questionable questionably uncertain

WEAK

indefinitely

ADVERB

easily

Synonyms

STRONGEST

actually certainly clearly definitely probably really surely

WEAK

absolutely almost certainly assuredly beyond question by far decidedly doubtless doubtlessly far and away indeed indisputably indubitably no doubt plainly positively truly undoubtedly unequivocally unquestionably

Antonyms

STRONGEST

doubtfully dubiously indefinitely questionably

WEAK

difficultly doubtedly dubitably

ADVERB

indeed

Synonyms

STRONGEST

absolutely certainly easily naturally really surely truly undoubtedly very very much

WEAK

amen doubtlessly even for real in point of fact in truth much of course positively strictly sure thing to be sure verily veritably well

Antonyms

STRONGEST

doubtfully dubiously indefinite questionably

ADVERB

obviously

Synonyms

STRONGEST

apparently certainly clearly definitely evidently noticeably plainly seemingly surely undoubtedly visibly

WEAK

distinctly incontestably of course openly unquestionably without doubt

Antonyms

STRONGEST

doubtfully dubiously equivocally indefinitely questionably uncertain vaguely

ADVERB

positively

Synonyms

STRONGEST

certainly easily emphatically firmly undoubtedly

WEAK

amen assuredly categorically doubtless doubtlessly flat flat out for a fact indubitably no catch no holds barred no ifs ands or buts no kicker no strings attached on the money on the nose really truly right on sure surely the ticket to a tee unequivocally unmistakably unquestionably with certainty without qualification

Antonyms

STRONGEST

doubtfully questionably

ADVERB

undoubtedly

Synonyms

STRONGEST

assuredly definitely doubtless easily indeed really surely truly unquestionably

WEAK

beyond question beyond shadow of a doubt of course unmistakably well without doubt

Antonyms

STRONGEST

doubtedly doubtfully dubiously questionably uncertain

WEAK

indefinite

ADVERB

unquestionably

Synonyms

STRONGEST

absolutely definitely surely undoubtedly

STRONG

decidedly emphatically unimpeachably

WEAK

assuredly certainly incontrovertibly indefensibly indubitably of course positively unequivocally

Antonyms

STRONGEST

doubtfully indefinite questionably

WEAK

dubiously

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.

While grammar and vocabulary are undeniably important aspects of language learning, they don’t exist in isolation from how people communicate in everyday life.

From Science Daily • May 22, 2026

The court sided with the public prosecution, which had argued that negligence by the plane maker and the airline “had undeniably contributed” to the crash.

From The Wall Street Journal • May 21, 2026

Believer or not, ufologist or not, the files were undeniably creating buzz on Friday; Ege said he looked forward to the promised upcoming releases of more.

From BBC • May 8, 2026

There’s far more to the story than Spikevax, though Covid revenue was undeniably the shining star of the latest earnings report.

From Barron's • May 1, 2026

He told Caroline that Emma was “essentially going on well & undeniably growing.”

From "Charles and Emma: The Darwins' Leap of Faith" by Deborah Heiligman

undeniably

Example Sentences

Related Words