不可缺少

bùkěquēshǎo
indispensable

CEDICT

Entry Composition

1 不可 bùkě cannot; should not; must not
2 缺少 quēshǎo
  1. lack
  2. shortage of
  3. shortfall
  4. to be short (of)
  5. to lack

Related entries

必不可少 bìbùkěshǎo
  1. absolutely necessary
  2. indispensable
  3. essential
汤姆是必不可少的。

Tom is indispensable.

Source: Tatoeba

必要 bìyào
  1. necessary
  2. essential
  3. indispensable
  4. required
沒必要擔心。

There's no reason to be alarmed.

Source: Tatoeba

必需 bìxū
  1. to need
  2. to require
  3. essential
  4. indispensable
你必需马上去那儿。

It is necessary for you to go there immediately.

Source: Tatoeba