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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.

“He’s not talking normal, that’s for sure… He does a great job making sure guys are where they need to be.”

From Los Angeles Times

He said people should plan ahead and make sure they were prepared for delays.

From BBC

“I’m not sure that still won’t happen, but it didn’t get announced today.”

From Barron's

To be sure, more jets in the air mean more parts and service business down the road.

From Barron's

To be sure, reducing reliance on U.S. debt doesn’t mean one can eschew U.S. assets completely.

From Barron's

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.