Antonyms of adj horrible

1 sense of horrible

Sense 1
atrocious, frightful, horrifying, horrible, ugly -- (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")

INDIRECT (VIA alarming) -> unalarming -- (not alarming; assuaging alarm)

Similarity of adj horrible

1 sense of horrible

Sense 1
atrocious, frightful, horrifying, horrible, ugly -- (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")
       => alarming (vs. unalarming) -- (frightening because of an awareness of danger)