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stupid (adj.)

1540s, "mentally slow, lacking ordinary activity of mind, dull, inane," from French stupide (16c.) and directly from Latin stupidus "amazed, confounded; dull, foolish," literally "struck senseless," from stupere "be stunned, amazed, confounded," from PIE *stupe- "hit," from root *(s)teu- (1) "to push, stick, knock, beat" (see steep (adj.)). Related: Stupidly; stupidness.

Native words for this idea include negative compounds with words for "wise" (Old English unwis, unsnotor, ungleaw), also dol (see dull (adj.)), and dysig (see dizzy (adj.)). Stupid retained its association with stupor and its overtones of "stunned by surprise, grief, etc." into mid-18c. The difference between stupid and the less opprobrious foolish roughly parallels that of German töricht vs. dumm but does not exist in most European languages.

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Definitions of stupid from WordNet
1
stupid (adj.)
in a state of mental numbness especially as resulting from shock;
was stupid from fatigue
Synonyms: dazed / stunned / stupefied
stupid (adj.)
lacking or marked by lack of intellectual acuity;
stupid (adj.)
lacking intelligence;
Synonyms: unintelligent
2
stupid (n.)
a person who is not very bright;
The economy, stupid!
Synonyms: stupid person / stupe / dullard / dolt / pudding head / pudden-head / poor fish / pillock
From wordnet.princeton.edu