確実(かくじつ)

かくじつ
na-adjective / noun
certain, reliable
1. certain, sure, definite
Something that is beyond doubt; guaranteed to happen.
成功(せいこう)は確実(かくじつ)だ。
Success is certain.
合格(ごうかく)は確実(かくじつ)ではない。
Passing is not certain.
この天気(てんき)なら、明日(あした)の試合(しあい)は確実(かくじつ)に行(おこな)われるだろう。
With this weather, tomorrow's game will certainly take place.
2. reliable, sound, steady
Trustworthy and dependable; not likely to fail.
確実(かくじつ)に届(とど)く方法(ほうほう)を教(おし)えてください。
Please tell me a method that will reliably deliver it.
確実(かくじつ)な情報(じょうほう)がほしい。
I want reliable information.
確実(かくじつ)に届(とど)けるために、書留(かきとめ)で送(おく)った。
I sent it by registered mail to ensure reliable delivery.

確実(かくじつ) means certain, reliable, or definite. It can function as both a na-adjective and a noun.

FORMS:

  • Na-adjective: 確実(かくじつ)な (certain, reliable)
  • Adverbial: 確実(かくじつ)に (certainly, reliably)

COMMON PATTERNS:

  • 確実(かくじつ)に〜する (to do ~ reliably/for certain)
  • 確実(かくじつ)な方法(ほうほう) (reliable method)
  • 確実(かくじつ)な証拠(しょうこ) (definite evidence)
  • 確実(かくじつ)性(せい) (certainty, reliability)

SIMILAR WORDS:

  • 確(たし)か: 'probably,' 'if I remember correctly' - expresses uncertainty
  • 確実(かくじつ): 'certain,' 'definite' - expresses certainty
  • 間違(まちが)いない: 'no doubt,' 'definitely'

Related Words

Contrast: 確(たし)か (probably)
Antonym: 不確実(ふかくじつ) (uncertain)
general
Added 2026.1.11 18:17 · Revised 2026.4.6 12:23
02500/02538_kakujitsu