adjective

1. having relatively great depth; of considerable extent from one surface or side to the opposite; not thin a thick board
2. having relatively large diameter in relation to length a thick pipe
3. as measured in the third dimension or between opposite surfaces a wall six inches thick
4. having the constituent elements abundant and close together; specif.,
   1. marked by profuse, close growth; luxuriant thick hair, thick woods
   2. great in number and packed closely together a thick crowd
   3. having much body; not thin in consistency; viscous thick soup
   4. dense and heavy thick smoke, a thick snowfall
   5. filled with smoke, fog, or other vapors
   6. covered to a considerable depth roads thick with mud
   7. sprinkled or studded profusely a sky thick with stars
5. impenetrably dark, dismal, or obscure the thick shadows of night
6. 1. sounding blurred, slurred, muffled, fuzzy, etc., or husky, hoarse, etc. a thick voice, thick speech
   2. strongly marked; pronounced speaking with a thick brogue
7. Informal slow to understand; stupid
8. Informal close in friendly association; intimate
9. Chiefly Brit., Informal too much to be tolerated; excessive

Etymology: ME thikke < OE thicce, thick, dense, akin to Ger dick < IE base *tegu-, thick, fat > OIr tiug

adverb

noun