Definitions

to be sure

ADVERB

indeed

Synonyms

STRONGEST

absolutely certainly easily naturally really surely truly undeniably undoubtedly very very much

WEAK

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

Antonyms

STRONGEST

doubtfully dubiously indefinite questionably

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 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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to be sure

Most summer classes also tend to follow federal holiday schedules, so they are likely closed, but check with your school or school district to be sure.

From MarketWatch ● Jul. 3, 2026

This might already be showing up in the stock market, although the speculation in microchip shares is so extreme it’s hard to be sure.

From The Wall Street Journal ● Jun. 28, 2026

"It's not enough to put down a glass of water and tell them to drink. You have to be sure they actually do," said head nurse Badra Hamadi.

From Barron's ● Jun. 23, 2026

He said they needed to be sure that the prosecution had proved its case beyond reasonable doubt.

From BBC ● Jun. 17, 2026

Bat wanted to be sure that Israel was taking this seriously.

From "A Boy Called Bat" by Elana K. Arnold

to be sure

Example Sentences

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