surest

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

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.

Who knows if Mr. Musk will every colonize Mars, but the surest bet is never to bet against American innovation.

From The Wall Street Journal • May 21, 2026

The surest way to snag great travel tips and become overwhelmed and riled up all at once while planning a vacation?

From The Wall Street Journal • Feb. 25, 2026

The surest sign of market dislocation is when banks start quantifying their exposure to a given issue.

From MarketWatch • Feb. 24, 2026

The Sutton Trust, a charity that aims to improve social mobility and address educational disadvantage, said that gaining a degree from an elite university was the surest way to improve social mobility.

From BBC • Feb. 9, 2026

Helene nodded and went back to her seat trying to think of other things—for the surest way to have an accident would be to remember her full bladder.

From "Sula" by Toni Morrison