thick

American Heritage® Dictionary of the English Language, Fourth Edition

1. adj. Relatively great in extent from one surface to the opposite, usually in the smallest solid dimension; not thin: a thick board.
2. adj. Measuring a specified number of units in this dimension: two inches thick.
3. adj. Heavy in form, build, or stature; thickset: a thick neck.
4. adj. Having component parts in a close, crowded state or arrangement; dense: a thick forest.
5. adj. Having or suggesting a heavy or viscous consistency: thick tomato sauce.
6. adj. Having a great number; abounding: a room thick with flies.
7. adj. Impenetrable by the eyes: a thick fog.
8. adj. Not easy to hear or understand; indistinctly articulated: the thick speech of a drunkard.
9. adj. Producing indistinctly articulated sounds: the thick tongues of barbarians.
10. adj. Strongly apparent; conspicuous: a thick brogue.
11. adj. Informal Lacking mental agility; stupid.
12. adj. Informal Very friendly; intimate: thick friends.
13. adj. Informal Going beyond what is tolerable; excessive.
14. adv. In a thick manner; deeply or heavily: Seashells lay thick on the beach.
15. adv. In a close, compact state or arrangement; densely: Dozens of braids hung thick from the back of her head.
16. adv. So as to be thick; thickly: Slice the bread thick for the best French toast.
17. n. The thickest part.
18. n. The most active or intense part: in the thick of the fighting.
19. idiom. thick and thin Good and bad times: They remained friends through thick and thin.

Century Dictionary and Cyclopedia

1. Having relatively great extent or depth from one surface to its opposite; being relatively of great depth, or extent from side to side: opposed to thin.
2. Having (a specified) measurement in a direction perpendicular to that of the length and breadth; measuring (so much) between opposite surfaces: as, a board one inch thick.
3. Having numerous separate parts or individuals set or occurring close together; dense; compactly arranged.
4. Having relatively great consistency; also, containing much solid matter in suspension or solution; approaching the consistency of a solid; inspissated: as, thick cream; thick paste; often of liquids, turbid; muddy; cloudy.
5. Heavy; profound; intense; extreme; great.
6. Obscure; not clear; especially, laden with clouds or vapor; misty; foggy: noting the atmosphere, the weather, etc.
7. Mentally dull; stupid: devoid of intelligence: as, to have a thick head.
8. Mentally clouded; befogged; slow, weak, or defective in sense-perception, sometimes in moral perception: as, to be thick of sight, hearing, etc.: said of persons or of the organs of sense.
9. Indistinct in utterance; inarticulate; not clear.
10. Abounding; filled; plentifully supplied: followed by with (formerly of or for).
11. Numerous; plentiful; frequent; crowded.
12. Being of a specified number; numbering.
13. Close in friendship; intimate.
14. n. The thickest part of anything. That part which is of longest measurement across or through; the bulkiest part.
15. n. The densest or most crowded part; the place of greatest resort or abundance.
16. n. The spot of greatest intensity or activity.
17. n. The time when anything is thickest.
18. n. A thicket; a coppice.
19. n. A stupid person; a dullard; a blockhead; a numskull.
20. In a thick manner, in any sense.
21. To make thick; thicken. To make close, dense, or compact; specifically, to make compact by fulling.
22. To increase in depth or girth; swell the proportions of (a solid body); fatten.
23. To give firmer consistency to; inspissate.
24. To make obscure or dark; hence, to hide; conceal.
25. To become thick.

Wiktionary

1. adj. Relatively great in extent from one surface to the opposite in its smallest solid dimension.
2. adj. Measuring a certain number of units in this dimension.
3. adj. Heavy in build; thickset.
4. adj. Densely crowded or packed.
5. adj. Having a viscous consistency.
6. adj. Abounding in number.
7. adj. Impenetrable to sight.
8. adj. Difficult to understand, or poorly articulated.
9. adj. informal Stupid.
10. adj. informal Friendly or intimate.
11. adj. Deep, intense, or profound.
12. adv. In a thick manner.
13. adv. Thickly.
14. n. The thickest, or most active or intense part of something.
15. v. archaic, transitive To thicken.

GNU Webster's 1913

1. adj. Measuring in the third dimension other than length and breadth, or in general dimension other than length; -- said of a solid body.
2. adj. Having more depth or extent from one surface to its opposite than usual; not thin or slender.
3. adj. Dense; not thin; inspissated. Also used figuratively.
4. adj. Not transparent or clear; hence, turbid, muddy, or misty.
5. adj. Abundant, close, or crowded in space; closely set; following in quick succession; frequently recurring.
6. adj. Not having due distinction of syllables, or good articulation; indistinct.
7. adj. rare Deep; profound.
8. adj. Dull; not quick.
9. adj. colloq. Intimate; very friendly; familiar.
10. n. The thickest part, or the time when anything is thickest.
11. n. obsolete A thicket.
12. adv. Frequently; fast; quick.
13. adv. Closely.
14. adv. To a great depth, or to a greater depth than usual.
15. v. rare To thicken.

WordNet 3.0

1. adj. having a short and solid form or stature
2. adj. not thin; of a specific thickness or of relatively great extent from one surface to the opposite usually in the smallest of the three solid dimensions
3. adj. relatively dense in consistency
4. adv. with a thick consistency
5. adj. abounding; having a lot of
6. n. the location of something surrounded by other things
7. adj. having component parts closely crowded together
8. adj. (of darkness) very intense
9. adj. (used informally) stupid
10. adv. in quick succession
11. adj. spoken as if with a thick tongue
12. adj. hard to pass through because of dense growth
13. adj. (used informally) associated on close terms