1. Very bad, unpleasant, or unsightly: The accidents on the highway during the snowstorm were horrible sights.
2. Sufficiently frightening, distressing, or stupefying so as to provoke suffering: The flood caused the sewer to send out a horrible odor.
3. Unkind, rude, or ill-behaved: The horrible behavior of the drunk on the sidewalk resulted in his being arrested by the police.
4. Arousing or tending to arouse repulsive feelings: After the conviction of the accused murderers, the judge stated that it was difficult to conceive of a more despicable or a more horrible crime.