- The definition of horrendous is something really bad, horrible or awful.
An extremely bad and unpleasant experience is an example of a horrendous experience.
horrendous definition by Webster's New World
Origin: Classical Latin horrendus ; from present participle of horrere: see horrid
- horrendously adverb
horrendous definition by American Heritage Dictionary
Origin: From Latin horrendus, from gerundive of horrēre, to tremble.
- hor·renˈdous·ly adverb