Thick wall square steel tubing. (of a solid having three general dimensions) measured across its smallest dimension: a board one inch thick. Thick things are broad or bulky or decidedly not thin — think of the thick slab of ice you need in order to skate safely on a lake. They walked through thick forest. If something that consists of several things is thick, it has a large number of them very close together. See examples of THICK used in a sentence. Synonyms for THICK: fat, dense, wide, chunky, deep, bulky, broad, blocky; Antonyms of THICK: thin, slender, narrow, skinny, slim, shallow, watery, runny The meaning of THICK is having or being of relatively great depth or extent from one surface to its opposite. . Oct 5, 2025 ยท thick (comparative thicker, superlative thickest) In a thick manner. 3. Synonyms for THICK: fat, dense, wide, chunky, deep, bulky, broad, blocky; Antonyms of THICK: thin, slender, narrow, skinny, slim, shallow, watery, runny. 2bfqxdi2j0gp6bbbnyi5n0e8xeyabwscnq0n9b2bfjlbhc