確か
確
irregular okurigana usage
慥か
たしか
adjectival nouns or quasi-adjectives (keiyodoshi)
noun (common) (futsuumeishi)
sure
certain
positive
definite
reliable
trustworthy
safe
sound
firm
accurate
correct
exact
adverb (fukushi)
If I'm not mistaken
If I remember correctly
If I remember rightly
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