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From The Collaborative International Dictionary of English v.0.48:
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]