せいいっぱい 精一杯 Common word Wanikani level 30 Play audio LinksSentence search for 精一杯Sentence search for せいいっぱいSentence search for 精いっぱいKanji details for 精, 一 and 杯Edit in JMdict Noun1. the best one can do; one's best effortNoun, Adverb (fukushi)2. with all one's might; to the best of one's abilityOther forms精いっぱい 【せいいっぱい】 Discussions Log in to talk about this word.