Definitions
1.NounA thing that causes horror; a terrifying thing, particularly a prospective bad consequence asserted as likely to result from an act.
2.NounA person wearing a comic or grotesque costume in a parade of horribles.
3.AdjectiveCausing horror; terrible; shocking.
4.AdjectiveTremendously bad.
5.Adjective1 2 3 The American Heritage Dictionary of the English Language, Fourth Edition
6.Adjective1 2 3 4 Dictionary.com Unabridged (v 1·1)
7.Adjective1 2 3 Online Etymology Dictionary, © 2001 Douglas Harper