In the thick of the fighting. Composed of or containing objects, particles, etc. , close together; Thick may refer to: If something that consists of several things is thick , it has a large number of them very close together. Discover everything about the word thick in english: Meanings, translations, synonyms, pronunciations, examples, and grammar insights - all in one comprehensive guide. They walked through thick forest. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. The meaning of thick is having or being of relatively great depth or extent from one surface to its opposite. (of a solid having three general dimensions) measured across its smallest dimension: She inherited our fathers thick , wavy hair. Having a specified distance from one surface to the opposite surface having a specified thickness Having a large distance between the top and bottom or front and back surfaces not thin; A board one inch thick. Thick adjective [-er/-est only] (close together) (of particular things) close together with little space between them: · a thick theory, such as libertarianism or socialism, is not appropriate as the basis for a constitution in a pluralistic society in which the people hold differing views about the good (or justice). The most active or intense part: Definition of thick adjective in oxford advanced learners dictionary. How to use thick in a sentence. The thickest part.