Word:

  stupid

1. stupid (a)
  lacking or marked by lack of intellectual acuity.

2. stupid (a)
  lacking intelligence.

3. stupid (n)
  a person who is not very bright. "The economy, stupid!".

Also see
stupid,  stupid,  unintelligent,  unintelligent,  stupid,  stupid,  retarded,  retarded

Opposite meanings of stupid (Anytonyms)
smart,  smart,  intelligent,  intelligent

Attribute
intelligence,  intelligence

Words derived from stupid
stupidity,  dolt,  dullard,  pillock,  poor fish,  pudden-head,  pudding head,  stupe,  stupid,  stupid person,  stupidity,  dolt,  dullard,  pillock,  poor fish,  pudden-head,  pudding head,  stupe,  stupid,  stupid person,  stupid,  stupid,  unintelligent

stupid is an instance of
simple,  simpleton

Word and things that fall within stupid
berk,  blockhead,  bonehead,  dumbass,  dunce,  dunderhead,  fuckhead,  hammerhead,  knucklehead,  loggerhead,  lunkhead,  muttonhead,  numskull,  shithead,  klutz