思いっきし おもいっきし Also written 思いっ切し Meanings Adverb with all one's strength; with all one's heart See also: 思いっきり (おもいっきり). Noun resignation; resolution See also: 思いっきり (おもいっきり). Kanji 思 think. Read as おもう. Word lists Colloquial Jinuma: Japanese Dictionary · Word lists