Adjective
lacking intelligence
Source: WordNetThe more unintelligent a man is, the less mysterious existence seems to him. Arthur Schopenhauer
That young girl is one of the least benightedly unintelligent organic life forms it has been my profound lack of pleasure not to be able to avoid meeting. Douglas Adams
Usually this desire [for family limitation] has been laid to economic pressure It has asserted itself among the rich and among the poor, among the intelligent and the unintelligent. It has been manifested in such horrors as infanticide, child abandonment and abortion. Margaret Sanger
Respond intelligently even to unintelligent treatment. Laozi
Unintelligent people always look for a scapegoat. Ernest Bevin
Unintelligent persons are like weeds that thrive in good ground; they love to be amused in proportion to the degree in which they weary themselves. Honoré de Balzac