Jisho

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Adverb (fukushi), Adverb taking the 'to' particle, Suru verb
1. tightly (holding on); firmly; securelyUsually written using kana alone, Onomatopoeic or mimetic word
Adverb (fukushi), Adverb taking the 'to' particle, Suru verb
2. strongly (built); solidly; sturdily; steadilyUsually written using kana alone, Onomatopoeic or mimetic word
Adverb (fukushi), Adverb taking the 'to' particle, Suru verb
3. properly; well; sufficiently; hard (working, etc.); fully; completelyUsually written using kana alone, Onomatopoeic or mimetic word
Adverb (fukushi), Adverb taking the 'to' particle, Suru verb
4. reliably; dependably; levelheadedly; shrewdly; wisely; cleverlyUsually written using kana alone, Onomatopoeic or mimetic word
Other forms
聢り 【しっかり】
Notes
確り: Rarely-used kanji form. 聢り: Rarely-used kanji form.

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