Jisho

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Na-adjective (keiyodoshi)
1. sure; certain; positive; definite
  • かれ
  • まちが間違っている
  • たし確か
  • です
It is certain that he is wrong.
Na-adjective (keiyodoshi)
2. reliable; trustworthy; safe; sound; firm; accurate; correct; exact
  • わたし
  • その
  • ニュース
  • たし確か
  • すじ
  • から
  • 得た
I got the news from a reliable source.
Adverb (fukushi)
3. If I'm not mistaken; If I remember correctly; If I remember rightly
  • これ
  • たし確か
  • たんすいぎょ淡水魚
  • おも思います
I believe this fish is a freshwater fish.
Other forms
確 【たしか】慥か 【たしか】
Notes
確: Irregular okurigana usage. 慥か: Rarely-used kanji form.

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