sure

adjective

Certain in one's knowledge or belief.

Physically secure and certain, non-failing, reliable.

(followed by a to infinitive) Certain to act or be a specified way.

(obsolete) Free from danger; safe; secure.

(obsolete) Betrothed; engaged to marry.

adverb

(modal) Without doubt, certainly.

(archaic) Without fail, surely.

Roots

securussure- · Latin · safe, free from care

Synonyms for sure

certainlyadv surelyadv certainadj assuredlyadv assuredadj confidentadj doubtlessadv convincedadj reassuredadj undoubting absolutelyadv yesn

Synonyms & related words for sure

Find synonyms, related words, and the definition of sure — including certainly, surely, certain, assuredly, assured, confident. Dendril is a free visual thesaurus that shows them on an interactive map where stronger matches sit closer to the center — no signup, no ads.

Words related to sure

Explore words related to sure — words associated with it, words that go with it, and its nearest matches in meaning. Related words include definitely, iwis, overassured, assures, betcha, obviously, trusted, if. Click any word to make it the center of the map and keep exploring the web of connections.

Synonyms for sure

Common synonyms for sure include certainly, surely, certain, assuredly, assured, confident, doubtless, convinced — words that share a close meaning. Hover or tap any word on the map for its definition and part of speech.

Where does sure come from?

The word sure breaks down into one root of Latin origin: the root sure-, from Latin securus (“safe, free from care”). Explore each root to see other English words built from the same source.