The city dump in Phnom Penh was the foulest 100 acres in Cambodia.
He laid false informations, fabricated the foulest charges, and caused the ruin of numbers of innocent people.
He poured forth a stream of the foulest abuse which the policeman had ever heard.
Incest and the foulest vices were bad enough, but witchcraft was worse.
In their private practices they perform the darkest and foulest crimes.
Both the compounds formed in this way dissolve and wash away; and so you may clean the foulest boiler or kettle.
"Fairest without is often foulest within, Bigot," answered Cadet, doggedly.
The foulest and most disgusting stories are being manufactured about you and me.
She had done him the foulest of wrongs,—she had ravaged his life.
They immediately uncovered him, and showed me a violent ulcer in the small of his back, in the foulest state that can be imagined.
Old English ful "rotten, unclean, vile, corrupt, offensive to the senses," from Proto-Germanic *fulaz (cf. Old Saxon and Old Frisian ful, Middle Dutch voul, Dutch vuil, Old High German fül, German faul, Gothic füls), from root *fu-, corresponding to PIE *pu-, perhaps from the sound made in reaction to smelling something bad (cf. Sanskrit puyati "rots, stinks," putih "foul, rotten;" Greek puon "discharge from a sore;" Latin pus "putrid matter," putere "to stink," putridus "rotten;" Lithuanian puviu "to rot").
Old English ful occasionally meant "ugly" (as contrasted with fæger (adj.), modern fair (adj.)), a sense frequently found in Middle English, and the cognate in Swedish is the usual word for "ugly." Of weather, first recorded late 14c. In the sporting sense of "irregular, unfair" it is first attested 1797, though foul play is recorded from mid-15c. Baseball sense of "out of play" attested by 1860. Foulmart was a Middle English word for "polecat" (from Old English mearð "marten").
Old English fulian "to become foul, rot," from ful (see foul (adj.)). Related: Fouled; fouling.