Very unpleasant; disagreeable.
Extreme; intense; severe
(Informal) Excessive; extreme:
The definition of dreadful is terrible, shocking or very disturbing.
The definition of ghastly is something repellent, horrible, frightful, ugly, macabre or sickly.
Not adequate in quality or quantity; inferior:
Causing horror, shock, or dismay
Foreshadowing evil or disaster; ominous.
Having an effect like that of a heavy blow or shock; staggering
Dire is defined as something that is urgent.
Terrible; greatly feared.
(Now Rare) Frightened; timid
Find another word for horrendous. In this page you can discover 23 synonyms, antonyms, idiomatic expressions, and related words for horrendous, like: horrible, frightening, terrifying, terrible, frightful, awful, dreadful, atrocious, hideous, ghastly and poor.