VISCOUS Meaning of VISCOUS in English adj. 1 glutinous, sticky. 2 semifluid. 3 Physics having a high viscosity; not flowing freely. viscously adv. viscousness n.[ ME f. AF viscous or LL viscosus (as VISCID) ] Concise Oxford English dictionary. Краткий оксфордский словарь английского языка. 2012