To regard with horror or loathing; detest.

In a sentence:
Julie’s such a bully; she always calls me out on my foreignness and makes me pronounce words in my Canadian accent—I absolutely abhor her!

In a different sentence:
I wish for once Steve would stop cheating on his eye exam; I abhor people who can’t face up to the fact that their vision’s impaired!

In a fact about cartoonist Charles Schulz:
As a kid, “Peanuts” creator Charles Schulz abhorred getting his hair clipped at his father’s barbership, because whenever “real customers” walked in he had to wait around with only half a haircut. (Good grief!)