1. Na-adjective (keiyodoshi)

   1.

   sure; certain; positive; definite

2. 2.

   reliable; trustworthy; safe; sound

3. Adverb (fukushi)

   3.

   If I'm not mistaken; If I remember correctly; If I remember rightly

Example sentences

• 確かに難問だね。

  It's certainly a difficult problem.

• それは確かです。

  I'm sure of it.