| thick | (adjective) 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 | - |
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| (adjective) relatively dense in consistency | - |
| (adjective) abounding; having a lot of | - |
| (adjective) (used informally) associated on close terms | Synonyms: buddy-buddy, chummy |
| (adjective) having component parts closely crowded together | Synonyms: dense |
| (adjective) hard to pass through because of dense growth | Synonyms: dense |
| (adjective) (of darkness) densely dark | Synonyms: deep |
| (adjective) having a short and solid form or stature | Synonyms: compact, heavyset, stocky, thickset |
| (adjective) (used informally) stupid | Synonyms: blockheaded, boneheaded, duncical, duncish, fatheaded, loggerheaded, thick-skulled, thickheaded, wooden-headed |
| (adjective) spoken as if with a thick tongue | Synonyms: slurred |
| thickened | (adjective) made or having become thick | - |
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| (adjective) made thick in consistency | - |
| (adjective) having calluses; having skin made tough and thick through wear | Synonyms: callous, calloused |
| thickening | (adjective) becoming more intricate or complex | - |
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| (adjective) accumulating and becoming more intense | Synonyms: deepening |
| thickheaded | (adjective) (used informally) stupid | Synonyms: blockheaded, boneheaded, duncical, duncish, fatheaded, loggerheaded, thick-skulled, thick, wooden-headed |
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| thickset | (adjective) planted or growing close together | - |
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| (adjective) having a short and solid form or stature | Synonyms: compact, heavyset, stocky, thick |
| thickspread | (adjective) covered thickly | - |
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| thieving | (adjective) given to thievery | Synonyms: thievish |
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| thievish | (adjective) given to thievery | Synonyms: thieving |
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| thin | (adjective) of relatively small extent from one surface to the opposite or in cross section | - |
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| (adjective) relatively thin in consistency or low in density; not viscous | - |
| (adjective) lacking excess flesh | Synonyms: lean |
| (adjective) (of sound) lacking resonance or volume | - |
| (adjective) not dense | Synonyms: sparse |
| (adjective) very narrow | Synonyms: slender |
| (adjective) lacking spirit or sincere effort | - |
| (adjective) lacking substance or significance | Synonyms: flimsy, fragile, slight, tenuous |
| thinkable | (adjective) capable of being conceived or imagined or considered | - |
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| thinking | (adjective) endowed with the capacity to reason | Synonyms: intelligent, reasoning |
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| thinned | (adjective) mixed with water | Synonyms: cut, weakened |
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| third | (adjective) coming next after the second and just before the fourth in position | Synonyms: 3rd, tertiary |
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| thirdhand | (adjective) derived from what is primary or original by two intermediate steps | - |
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| thirsty | (adjective) feeling a need or desire to drink | - |
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| (adjective) able to take in large quantities of moisture | - |
| (adjective) (usually followed by `for') extremely desirous | Synonyms: athirst, hungry |
| (adjective) needing moisture | - |
| thirteen | (adjective) being one more than twelve | Synonyms: 13, xiii |
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| thirteenth | (adjective) coming next after the twelfth in position | Synonyms: 13th |
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| thirtieth | (adjective) coming next after the twenty-ninth in position | Synonyms: 30th |
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| thirty | (adjective) being ten more than twenty | Synonyms: 30, xxx |
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| thistlelike | (adjective) resembling a thistle | - |
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