たしか

確か

表記・読み：確・慥か・たしか

1. 1

   sure; certain; positive; definite

   形容動詞
2. 2

   reliable; trustworthy; safe; sound; firm; accurate; correct; exact

   形容動詞
3. 3

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

   副詞