Sincere means genuine, honest, and not fake or deceptive. A sincere apology, for example, is one that is truly meant.

Quick meaning

  • Feelings or words: real and heartfelt.
  • Personality: honest and straightforward.
  • Opposite: insincere.

Example

  • “She gave a sincere apology” means she truly meant it.

If you want, I can also give you:

  • a simple one-line definition
  • synonyms and antonyms
  • example sentences