任意保険 にんいほけん Meanings Noun voluntary insurance; optional insurance; extra insurance (i.e.: vehicle insurance in addition to the basic mandatory insurance) See also: 強制保険 (きょうせいほけん). Kanji 任 entrust. Read as ニン. 意 mind 保 keep 険 peril. Read as ケン. Jinuma: Japanese Dictionary · Word lists