/ Dictionary / Index U underworld: Meaning and Definition of Find definitions for: un•der•world Pronunciation: (un'dur-wûrld"), [key] — n. the criminal element of human society. the imagined abode of departed souls or spirits; Hades. a region below the surface, as of the earth or a body of water. the opposite side of the earth; the antipodes. the earth. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: underworld (Thesaurus) underwork underwrite Related Content Daily Word Quiz: inutiae Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language