adj. not having a head or formed without a head ; "the headless horseman"; "brads are headless nails"

adj. not using intelligence

adj. devoid of intelligence

adj. heavy and dull and stupid

adj. insanely irresponsible; "an idiotic idea"

adj. not moving quickly; taking a comparatively long time; "a slow walker"; "the slow lane of traffic"; "her steps were slow"; "he was slow in reacting to the news"; "slow but steady growth"

adj. lacking mental capacity and devoid of subtlety

adj. slow to learn or understand; lacking intellectual acuity; "so dense he never understands anything I say to him"; "never met anyone quite so dim"; "although dull at classical learning, at mathematics he was uncommonly quick"- Thackeray; "dumb officials make some really dumb decisions"; "he was either normally stupid or being deliberately obtuse"; "worked with the slow students"

adj. incongruous;inviting ridicule; "the absurd excuse that the dog ate his homework"; "that's a cockeyed idea"; "ask a nonsensical question and get a nonsensical answer"; "a contribution so small as to be laughable"; "it is ludicrous to call a cottage a mansion"; "a preposterous attempt to turn back the pages of history"; "her conceited assumption of universal interest in her rather dull children was ridiculous"

adj. showing or resulting from lack of judgment or wisdom; "an unwise investor is soon impoverished"

adj. not prudent or wise; "very imprudent of her mother to encourage her in such silly romantic ideas"; "would be imprudent for a noneconomist to talk about the details of economic policy"- A.M.Schlesinger

adj. not prudent or wise; not recommended; "running on the ice is inadvisable"

adj. mentally deficient

adj. having a mental age of three to seven years

adj. having a mental age of between eight and twelve years

adj. having a head of a specified kind or anything that serves as a head; often used in combination; "headed bolts"; "three-headed Cerberus"; "a cool-headed fighter pilot"

adj. having the capacity for thought and reason especially to a high degree; "is there intelligent life in the universe?"; "an intelligent question"