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.

It’s a return to innocence — a gustatory reminder of those carefree childhood moments when I indulged in the sourest of sour treats to my heart’s content.

From Salon • Sep. 13, 2025

"Has that not just left the sourest taste in the mouth at the end of this international summer? I'm dumbfounded," said England all-rounder Georgia Elwiss on BBC Test Match Special.

From BBC • Sep. 24, 2022

Filipino cooking is among the world’s brightest, sweetest, sourest, and funkiest of world cuisines; by comparison, almost any other food seems bland.

From The New Yorker • Dec. 19, 2018

Perhaps the sourest note came from ABC with word that it’s canceling “Nashville” after four seasons.

From Seattle Times • May 13, 2016

Besides, I should always be in the sourest humor: for why is it that the pious and the devotional are so hard, so repellent, so unsociable?

From Library of the World's Best literature, Ancient and Modern, Vol. 12 by Various