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Atrocious and terrible are synonymous, yes.
giggety
Atrocious is an adjective. The adverb is atrociously and the noun is atrocity.
You have atrocious hair today! ((Your hair looks terrible))
I can't believe that atrocious color was included in the painting ((that color in the painting is terrible.))
ect ect.
Atrocious means it is something unbelievable or silly.
The duration of Atrocious - film - is 1.25 hours.