certain

Bound to happen

Certain means sure or definite.

If you're certain about something, you have no doubt: I'm certain I locked the door.

Certain facts are established beyond question.

The word also picks out unspecified particulars: certain people, a certain charm.

This vagueness can be pointed—a certain someone hints at knowledge withheld.

To a certain extent means partly but not completely.

undeniable

indisputable

Impossible to contest

undoubted · indubitable · conclusive · absolute · categorical · decisive · proven · evident · obvious · manifest

definite

specific

Clearly defined, not vague

explicit · clear · unambiguous · unequivocal · distinct · concrete · defined · fixed · established · determined

inevitable

unavoidable

Impossible to prevent

bound · predestined · assured · guaranteed · inexorable · predetermined · foreordained · expected · impending · forthcoming

assured

confident

Sure of oneself

satisfied · secure · settled · decided · resolved · determined · untroubled · unhesitating · unwavering · steadfast

reliable

dependable

Worthy of trust

foolproof · infallible · sure-fire · fail-safe · tried · tested · proven · steady · consistent · predictable

Categories
Opposites
epistemic confidence

certainuncertain

Not firmly known

unsure · doubtful · unconfident · hesitant · wavering

outcome determinacy

certainuncertain

Not firmly known

unlikely · improbable · unpredictable · doubtful · questionable

specificity of reference

certainindefinite

Not precisely determined

unspecified · undefined · indeterminate · undetermined · vague

Phrases
Family

certainly, uncertain, uncertainty, certainty, ascertain, uncertainly, uncertainties, ascertained, ascertaining

Familiarity
Top 500
Profile
Known to kids · Used worldwide · Timeless · Abstract · Everyday, not technical · Rated G