Definitions

sure

[shoor, shur] / ʃʊər, ʃɜr /

ADJECTIVE

certain, definite

Synonyms

STRONGEST

assured clear confident convinced positive

WEAK

abiding changeless constant convincing decided doubtless enduring firm fixed for a fact free from doubt genuine incontestable incontrovertible indisputable indubitable never-failing persuaded real satisfied set steadfast steady telling unchangeable unchanging uncompromising undeniable unequivocal unfailing unfaltering unqualified unquestionable unquestioning unshakable unshaken unvarying unwavering valid

Antonyms

STRONGEST

doubtful uncertain unsure

WEAK

doubted dubious humbled indefinite swerving unconfident unself-confident unsteady variable wavering wobbly

ADJECTIVE

physically stable

Synonyms

STRONGEST

fast safe strong

WEAK

firm fixed secure solid staunch steady

Antonyms

WEAK

doubted doubtful dubious humbled indefinite swerving uncertain unconfident unself-confident unsteady unsure variable wavering wobbly

ADJECTIVE

inevitable

Synonyms

STRONGEST

assured certain

WEAK

bound guaranteed indisputable ineluctable inerrant inescapable infallible irrevocable surefire unavoidable unerring unfailing

Antonyms

STRONGEST

doubtful doubting hesitant uncertain

WEAK

doubted dubious humbled indefinite swerving unconfident unself-confident unsteady unsure variable wavering wobbly

ADJECTIVE

self-confident

Synonyms

STRONGEST

assured certain confident decisive positive

WEAK

arrogant composed decided self-assured self-possessed

Antonyms

STRONGEST

doubtful doubting hesitant indefinite uncertain unsure

WEAK

doubted dubious humbled swerving unconfident unself-confident unsteady variable wavering wobbly

Usage

What are other ways to say sure? Sure, the simplest and most general of a group of adjectives indicating full belief and trust that something is true, expresses the mere absence of doubt. Certain suggests that there are definite reasons that have freed one from doubt. Confident emphasizes the strength of the belief or the certainty of expectation felt. Positive implies emphatic certainty, which may even become overconfidence or dogmatism.

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.

Make sure you receive your investment statements directly, and have your accounts reviewed annually by a CPA to ensure all is A-OK.

From MarketWatch • Jun. 11, 2026

I’m sure the Knicks would be happy to finish it off in Texas, but if the Spurs prevail in Game 5, it sets up a potential championship clinch in the city for Game 6.

From The Wall Street Journal • Jun. 11, 2026

Guillermo Ochoa, who will be playing in his sixth World Cup with Mexico, is considered by many to be the ideal experienced goalkeeper to use during the opener, when nerves are sure to be high.

From Los Angeles Times • Jun. 11, 2026

"Suffice to say, we will take all reasonable measures to make sure kids are safe in this country," he told reporters.

From BBC • Jun. 10, 2026

Grandma senses that and says, “This is a major decision. You can spare a few hours to make sure you’re making the right one.”

From "Split the Sky" by Marie Arnold

sure

Usage

Example Sentences

Related Words