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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.

In reference to the increase in red diesel and fertiliser prices, the Chancellor Rachel Reeves said: "We will always make sure that we do everything we can to protect consumers."

From BBC

No one knows the answer to this for sure, but it will be related to engine design.

From BBC

Unlike adults, the younger inmates will always be accompanied by guards, whether to play football, paint or make sure they go to school and do their homework.

From Barron's

Whether Eleanor realized that or not, I wasn’t sure, but she moved on to another one.

From Literature

We drilled one another to make sure we knew the information cold.

From Literature

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