不要

bùyào
don't!; must not

CEDICT

Entry Composition

1 不 bù
  1. no; not so
  2. (bound form) not; un-
2 要 yào
  1. to want; to need; to ask for
  2. will; shall; about to
  3. need to; should
  4. if (same as 要是 yàoshi)
  5. (bound form) important