油断禁物 ゆだんきんもつ Meanings Expression be on your guard; negligence is the enemy See also: 油断は禁物 (ゆだんはきんもつ). Kanji 油 oil. Read as ユ. 断 sever. Read as ダン. 禁 forbid. Read as キン. 物 thing. Read as モツ. Jinuma: Japanese Dictionary · Word lists