無效

无效
wúxiào
  1. not valid
  2. ineffective
  3. in vain

CEDICT

Entry Composition

1 無 wú
  1. not to have
  2. no
  3. none
  4. not
  5. to lack
  6. un-
  7. -less
=2 效 xiào variant of 傚 xiào
=2 效 xiào to imitate (variant of 效 xiào)
=2 效 xiào variant of 效 xiào
=2 效 xiào
  1. effect
  2. efficacy
  3. to imitate