1.Definition: exceptionally bad or displeasing

"Atrocious taste"

Related Adjective(s):abominable, awful, dreadful, painful, terrible, unspeakable

2.Definition: provoking horror

"An atrocious automobile accident"

Related Adjective(s):frightful, horrible, horrifying, ugly

3.Definition: shockingly brutal or cruel

"Murder is an atrocious crime"

Related Adjective(s):flagitious, grievous, monstrous