Psychology . a person of the second order in a former classification of mental retardation, above the level of idiocy, having a mental age of seven or eight years and an intelligence quotient of 25 to 50.

a dunce; blockhead; dolt.

mentally feeble.

showing mental feebleness or incapacity.

stupid; silly; absurd.

Archaic . weak or feeble.

adjective

brainy , intelligent , smart

noun

brain

adjective

asinine , backward , deranged , dim-witted , dull , fatuous , feeble-minded , idiotic , imbecilic , inane , ludicrous , moronic , simple , simple-minded , slow , thick , witless

noun

birdbrain , dimwit , dolt , dummy , dunce , fool , idiot , jerk , lamebrain * , moron , pinhead * , simpleton , ass , jackass , mooncalf , nincompoop , ninny , nitwit , simple , softhead , tomfool , dumbbell , fatuous , silly , stupid , witling