ゆゆ 由々しい Show inflections LinksSentence search for 由々しいSentence search for ゆゆしいSentence search for 忌々しいKanji details for 由Edit in JMdict I-adjective (keiyoushi)1. grave; serious; alarmingOther forms忌々しい 【ゆゆしい】Notes由々しい: Ateji (phonetic) reading. 忌々しい: Rarely-used kanji form. Discussions Log in to talk about this word.