fetid /ˈfɛtɪd/adjective 2noun 1forms 3 adjective2 •Foul-smelling, stinking.I caught the fetid odor of dirty socks. •(slang, old-fashioned) Unpleasant."I'm not going to promise anything after the perfectly fetid way you're running off," she retorted. — 1934 noun1 •(rare) The foul-smelling asafoetida plant, or its extracts. formsfetids · more fetid · most fetid