Do you know ghouls from goblins and ghosts?
early 15c., from Latin fetidus (commonly, but incorrectly, foetidus) "stinking," from fetere "have a bad smell, stink." Perhaps connected with fimus "dung," or with fumus "smoke."
fetid fet·id (fět'ĭd, fē'tĭd)
Having an offensive odor.