Definitions

for certain

Part of Speech:

All (6) Adjective (3) Adverb (3)

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inevitable adj.
unmistakable adj.
unquestionable adj.
exactly adv.
for sure adv.
surely adv.

ADJECTIVE

inevitable

Synonyms

STRONGEST

imminent impending inescapable inexorable irresistible necessary unavoidable undeniable

STRONG

binding doomed pat

WEAK

all locked up assured compulsory decided decreed destined determined fated fateful fixed foreordained in the bag ineluctable ineludible inflexible irrevocable no ifs ands or buts obligatory ordained prescribed settled sure unalterable unpreventable without recourse

Antonyms

STRONGEST

avoidable distant escapable later

WEAK

doubtful fortuitous preventable uncertain unlikely unsure

ADJECTIVE

unmistakable

Synonyms

STRONGEST

apparent conspicuous distinct evident explicit indisputable obvious palpable pronounced straightforward unambiguous unequivocal

WEAK

clear decided glaring manifest no ifs ands or buts open and shut patent plain positive self-explanatory sure transparent univocal

Antonyms

STRONGEST

ambiguous disputable doubtful dubious equivocal hidden indefinite indistinct obscure questionable secret uncertain unclear unknown unsure vague

WEAK

doubtul mistakable

ADJECTIVE

unquestionable

Synonyms

STRONGEST

absolute indisputable self-evident undeniable unequivocal unmistakable

WEAK

accurate authentic bona fide certain clear cold conclusive dependable down pat downright established faultless flat flawless genuine incontestable incontrovertible indubitable irrefutable manifest no ifs ands or buts obvious pat patent perfect positive real reliable superior sure sure-enough true undisputable undoubted unimpeachable veritable well-founded well-grounded

Antonyms

STRONGEST

disputable indefinite uncertain unsure vague

WEAK

doubtful questionable

ADVERB

exactly

Synonyms

STRONGEST

absolutely altogether carefully completely correctly definitely explicitly indeed literally precisely quite specifically strictly totally truly

STRONG

just

WEAK

bang expressly faithfully faultlessly for a fact for sure in every respect methodically no mistake on the dot on the money on the nail on the nose positively right rigorously scrupulously severely sharp square the ticket truthfully unequivocally unerringly utterly veraciously wholly

Antonyms

STRONGEST

doubtfully dubiously incompletely indefinite partially questionably

WEAK

inaccurately inexactly

ADVERB

for sure

Synonyms

WEAK

certainly dead sure definitely for a fact for real no doubt no question no two ways about it really surely unquestionably

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 indubitably infallibly irrefutably manifestly nothing else but positively rain or shine to be sure unequivocally unerringly unfailingly unmistakably unshakably with certainty without fail

Antonyms

STRONGEST

doubtfully dubiously indefinite indefinitely questionably vaguely

WEAK

uncertain

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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for certain

It's too early to know for certain, and I've seen plenty of names not make the grade.

From BBC ● Sep. 27, 2026

However, “demand for GPU time is surging to record levels,” McPeake said in a Thursday note to clients, referring to the process by which neocloud customers rent computing power for certain amounts of time.

From MarketWatch ● Sep. 18, 2026

A half-century after this incident, not even the creators and stars of “American Hostage” can say for certain why we find stories like this so compelling — or why they keep happening in real life.

From Los Angeles Times ● Sep. 18, 2026

The proposed bank charter “would establish a federal supervisory framework for certain custody and related activities currently offered by Block,” the company said.

From The Wall Street Journal ● Sep. 8, 2026

“It took endless arm-twisting to get the French authorities to release the blueprints to make these sets. And while we believe they are exact, we don’t know for certain what’s in here.”

From "City Spies" by James Ponti

for certain

Example Sentences

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