THICKHEADS Synonyms

• (used informally) stupid

• permitting little if any light to pass through because of denseness of matter

• hard to pass through because of dense growth

• having high relative density or specific gravity

• slow to learn or understand; lacking intellectual acuity

• having component parts closely crowded together

• lacking mental capacity and subtlety

• heavy and dull and stupid

• lacking in liveliness or animation

• emitting or reflecting very little light

• not keenly felt

• not having a sharp edge or point

• being or made softer or less loud or clear

• so lacking in interest as to cause mental weariness

• (of color) very low in saturation; highly diluted

• slow to learn or understand; lacking intellectual acuity

• (of business) not active or brisk

• blunted in responsiveness or sensibility

• not clear and resonant; sounding as if striking with or against something relatively soft

• darkened with overcast

• make dull in appearance

• become dull or lusterless in appearance; lose shine or brightness

• deaden (a sound or noise), especially by wrapping

• make numb or insensitive

• make dull or blunt

• become less interesting or attractive

• make less lively or vigorous

• insanely irresponsible

• so unreasonable as to invite derision

• having a mental age of three to seven years

• of an angle; between 90 and 180 degrees

• (of a leaf shape) rounded at the apex

• lacking in insight or discernment

• slow to learn or understand; lacking intellectual acuity

• retarded in intellectual development

• having or revealing little emotion or sensibility; not easily aroused or excited

• someone who makes a loud high sound

• United States painter (1834-1903)

• large North American mountain marmot

• large-headed swift-flying diving duck of Arctic regions

• Australian and southeastern Asian birds with a melodious whistling call