Japanese deck
苦い
adjective·n4

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dictionary苦いnigai
bitter (basic form)
negative苦くないnigakunai
not bitter
past苦かったnigakatta
was bitter
past negative苦くなかったnigakunakatta
was not bitter
te form苦くてnigakute
and/because it is bitter (connective)
adverb苦くnigaku
bitterly (adverbial form)