[ひつよう, hitsuyou] (adj-na) (1) necessary; needed; essential; indispensable; (n) (2) necessity; need; requirement; (P) #191
[ひっす, hissu] (adj-na, n, adj-no) indispensable; required; (P) #5500
[ふかけつ, fukaketsu] (adj-na, n) indispensable; essential; (P) #11368
[ないといけない, naitoikenai] (exp, adj-i) (1) (uk) (See 無きゃいけない) (after negative base of verb) have to (verb); must (verb); (2) (esp. 無いといけない) is indispensable; absolutely necessary; (P)
[ないといけません, naitoikemasen] (exp) (1) (uk) (See ないと行けない・ないといけない・1) (after negative base of verb) have to (verb); must (verb); (2) (esp. 無いといけません) (See ないと行けない・ないといけない・2) is indispensable; absolutely necessary
[きょうげんまわし, kyougenmawashi] (n) supporting, but indispensable role; major supporting role
[かかせない, kakasenai] (exp, adj-i) indispensable; vital; fundamental; imperative; crucial; critical
[かくことができない, kakukotogadekinai] (exp, adj-i) (See 欠くことのできない, 欠くべからざる) indispensable; essential; necessary
[かくことのできない, kakukotonodekinai] (exp, adj-i) (See 欠くべからざる, 欠くことができない) indispensable; essential; necessary
[かくべからざる, kakubekarazaru] (exp, adj-i) (See 欠くことのできない, 欠くことができない) indispensable; essential; necessary
[ひっすかく, hissukaku] (n) { ling } indispensable case
[ひつようふかけつ, hitsuyoufukaketsu] (n, adj-na) essential; indispensable; imperative; necessary; compelling, vital, critical
[つきもの, tsukimono] (n) accessory; accompaniment; indispensable part; appendage
[ないと, naito] (exp) (1) (uk) (abbr) (col) (See ないと行けない・1) (after negative base of verb) have to (verb); must (verb); (2) (See ないと行けない・2) is indispensable; absolutely necessary
[なきゃいけない(無きゃいけない)(P);なくてはいけない(無くてはいけない)(P), nakyaikenai ( naki yaikenai )(P); nakutehaikenai ( naku tehaikenai )(P)] (exp) (1) (uk) cannot do without something; indispensable; absolutely necessary; (2) (after negative base of verb) have to do; (P)
[なきゃならない, nakyanaranai] (exp) (1) (uk) (See 無くてはならない) cannot do without something; indispensable; absolutely necessary; (2) (See ねばならない) (after negative base of verb) have to do
[なくてはならない, nakutehanaranai] (exp) (1) (uk) (See 無い) cannot do without something; indispensable; absolutely necessary; (2) (See なければならない) (after negative base of verb) have to do