Jisho

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Adverb (fukushi)
1. surely; undoubtedly; almost certainly; most likely (e.g. 90 percent)​Usually written using kana alone, Onomatopoeic or mimetic word
  • でも
  • よー
  • 、
  • オラ
  • の
  • おとうさん
  • は
  • よ良い
  • き気
  • しねー
  • よ
  • 、
  • きっと
  • 。
But I don't think Dad would like me to.
Adverb (fukushi)
2. sternly; severely​Usually written using kana alone, Onomatopoeic or mimetic word, esp. キッと
Adverb (fukushi)
3. having no slack; rigid; stiff; tight​Usually written using kana alone, Onomatopoeic or mimetic word
Adverb (fukushi)
4. suddenly; abruptly; instantly​Usually written using kana alone, Onomatopoeic or mimetic word, Archaic
Other forms
急度 【きっと】、キッと
Notes
屹度: Ateji (phonetic) reading, Rarely-used kanji form. 急度: Ateji (phonetic) reading, Rarely-used kanji form.

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