If you say that weather conditions are atrocious, you mean they are very bad, for example that it is extremely cold, wet, or windy. = appalling. extremely bad = awful (atrox , from ater + -ox )
provoking horror; "an atrocious automobile accident"; "a frightful crime of decapitation"; "an alarming, even horrifying, picture"; "war is beyond all words horrible"- Winston Churchill; "an ugly wound"
If you describe someone's behaviour or their actions as atrocious, you mean that it is unacceptable because it is extremely violent or cruel. The judge said he had committed atrocious crimes against women = appalling
emphasis If you describe something as atrocious, you are emphasizing that its quality is very bad. The food here is atrocious. = appalling, abominable + atrociously atro·cious·ly He had written the note from memory, word perfect, and spelled atrociously
exceptionally bad or displeasing; "atrocious taste"; "abominable workmanship"; "an awful voice"; "dreadful manners"; "a painful performance"; "terrible handwriting"; "an unspeakable odor came sweeping into the room"
shockingly brutal or cruel; "murder is an atrocious crime"; "a grievous offense against morality"; "a grievous crime"; "no excess was too monstrous for them to commit