From WordNet (r) 3.0 (2006) [wn]:
stupid
adj 1: lacking or marked by lack of intellectual acuity [ant:
smart]
2: in a state of mental numbness especially as resulting from
shock; "he had a dazed expression on his face"; "lay
semiconscious, stunned (or stupefied) by the blow"; "was
stupid from fatigue" [syn: dazed, stunned, stupefied,
{stupid(p)}]
3: lacking intelligence; "a dull job with lazy and unintelligent
co-workers" [syn: unintelligent, stupid] [ant:
intelligent]
n 1: a person who is not very bright; "The economy, stupid!"
[syn: stupid, stupid person, stupe, dullard,
dolt, pudding head, pudden-head, poor fish,
pillock]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Stupid \Stu"pid\, a. [L. stupidus, fr. stupere to be stupefied:
cf. F. stupide.]
1. Very dull; insensible; senseless; wanting in
understanding; heavy; sluggish; in a state of stupor; --
said of persons.
[1913 Webster]
O that men . . . should be so stupid grown . . .
As to forsake the living God! --Milton.
[1913 Webster]
With wild surprise,
A moment stupid, motionless he stood. --Thomson.
[1913 Webster]
2. Resulting from, or evincing, stupidity; formed without
skill or genius; dull; heavy; -- said of things.
[1913 Webster]
Observe what loads of stupid rhymes
Oppress us in corrupted times. --Swift.
[1913 Webster]
Syn: Simple; insensible; sluggish; senseless; doltish;
sottish; dull; heavy; clodpated. -- Stu"pid*ly, adv.
-- Stu"pid*ness, n.
[1913 Webster]