English dictionaryviscous adjective Copy definition Share Print / Save as PDFPronunciation /ˈvɪs.kəs/ /ˈvɪs.kəs/Audio pronunciation ▶ Recording 1 ▶ Recording 2 Parts of speech adjectiveDefinitionsadjectiveHaving a thick, sticky consistency between solid and liquid.Of or pertaining to viscosity.Synonyms syrupy thickflowing viscid viscoseAntonyms inviscid