Synonyms for Unintelligent:

adj.

feebleminded (adjective)
Weak-minded.
foolish (adjective)
imbecilic.
ignorant (adjective)
ignorant, uneducated, empty-headed, mindless, simple, illiterate, foolish, uninformed, unlearned, brainless.
simple (adjective)
uneducated.
slow-witted (adjective)
slow-witted.
stupid (adjective)
idiotic, empty-headed, foolish, witless, senseless, moronic, brainless, half-witted, mindless, imbecilic, simple.
unintellectual (adjective)
idiotic, defective, imbecilic, unintellectual, cretinous, foolish, half-wit, moronic.
witless (adjective)
witless.

n.

compatible, best-of-breed, asynchronous, Antivirus, backward-compatible, clickable, compatibility, bursty, case-sensitive, active. planned, fatuous, insensate, witless, ability, simple-minded, silly, senseless, Weak-minded. unintelligent (noun)
headless, feebleminded, imbecile, moronic, brainless, slow-witted, half-witted, imbecilic.
unlearned (noun)
untaught.

Other synonyms:

witless, simple-minded. fatuous, Weak-minded, silly. senseless. insensate. Other relevant words:
imbecile, Antivirus, clickable, fatuous, compatibility, silly, witless, ability, Weak-minded, insensate, simple-minded, asynchronous, untaught, best-of-breed, slow-witted, senseless, headless, feebleminded, active, bursty, case-sensitive, planned, compatible, half-witted, backward-compatible.

Usage examples for unintelligent

  1. And that look of delight which would angels beguile Is the deaf man's prolonged unintelligent smile? – The Poetical Works of Oliver Wendell Holmes, Vol. 5 Poems Of The Class Of '29 (1851-1889) by Oliver Wendell Holmes, Sr.
  2. Her hair was very long and fine, dark brown with gleams of gold; her eyes were large, grey in colour, but, as I have said, unintelligent like an animal's, which to us always seem unintelligent – Lore of Proserpine by Maurice Hewlett
  3. One reason, perhaps, for extravagance in food and clothing on the part of unintelligent people who find themselves unusually prosperous, is that they see no better way to spend their money. – Community Civics and Rural Life by Arthur W. Dunn