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"
lacking in insight or discernment; "too obtuse to grasp the implications of his behavior"; "a purblind oligarchy that flatly refused to see that history was condemning it to the dustbin"- Jasper Griffin
of an angle; between 90 and 180 degrees
(of a leaf shape) rounded at the apex
so lacking in interest as to cause mental weariness; "a boring evening with uninteresting people"; "the deadening effect of some routine tasks"; "a dull play"; "his competent but dull performance"; "a ho-hum speaker who couldn't capture their attention"; "what an irksome task the writing of long letters is"- Edmund Burke; "tedious days on the train"; "the tiresome chirping of a cricket"- Mark Twain; "other people's dreams are dreadfully wearisome"
without speed (`slow' is sometimes used informally for `slowly'); "he spoke slowly"; "go easy here--the road is slippery"; "glaciers move tardily"; "please go slow so I can see the sights"
of timepieces; "the clock is almost an hour slow"; "my watch is running behind"
lose velocity; move more slowly; "The car decelerated"
become slow or slower; "Production slowed"
cause to proceed more slowly; "The illness slowed him down"
(of business) not active or brisk; "business is dull (or slow
in quick succession; "misfortunes come fast and thick"
(used informally) stupid
with a thick consistency; "the blood was flowing thick"
(used informally) associated on close terms; "a close friend"; "the bartender was chummy with the regular customers"; "the two were thick as thieves for months"
having component parts closely crowded together; "a compact shopping center"; "a dense population"; "thick crowds"; "a thick forest"; "thick hair"
the location of something surrounded by other things; "in the midst of the crowd"
spoken as if with a thick tongue; "the thick speech of a drunkard"; "his words were slurred"
(of darkness) very intense; "thick night"; "thick darkness"; "a face in deep shadow"; "deep night"
hard to pass through because of dense growth; "dense vegetation"; "thick woods"
having a short and solid form or stature; "a wrestler of compact build"; "he was tall and heavyset"; "stocky leg