Word Type

Adjective

Adjective

Proper Noun

The word "sincere" can be used as adjective, adjective and proper noun.

Word Relationships

Opposites (Antonyms)

insincere insincere

Etymologically Related To

cereal

Related Terms

Ceres cereal crescent sincereness sincerity

Related Terms

clean does genuine heartfelt honest ingenuous mean pure real says true truly

Similar Terms

artless bona fide bona fide cordial cordial dear devout earnest echt existent genuine heart-whole heartfelt heartfelt honest honest honorable ingenuous real serious true unfeigned unfeigned whole souled whole-souled wholehearted

Synonym Network

earnest solemn

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.