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/sɪnˈsɪər/ · sin·cere
adjective
  1. Genuine; meaning what one says or does; heartfelt. I believe he is sincere in his offer to help.
  2. Meant truly or earnestly. She gave it a sincere, if misguided effort.
  3. Clean; pure. The water was sincere and refreshing.

Synonyms

Antonyms

Did you know? The word sincere has been used in English since the 15th century, and its Latin roots convey a sense of purity and authenticity.
Written by Lexi Wordsworth, Dictionary Editor 0 lookups Added Jul 14, 2026