despicable
So mean and awful that it deserves strong dislike.
Despicable means so mean, low, or cruel that it deserves contempt and disgust. When someone does something despicable, they act in a way that makes others lose all respect for them.
A despicable act might be stealing money from a charity, bullying someone weaker, or betraying a friend's trust for personal gain. What makes something despicable is that it reveals terrible character: selfishness, cruelty, or cowardice.
The word carries strong moral weight. Calling someone's behavior despicable means you find it beneath the standards of decent human behavior. A student who frames an innocent classmate for something they didn't do commits a despicable act. A leader who lies to people who trusted them acts despicably.
Despicable perfectly captures what we feel toward such actions: we look down on them with disgust. When you encounter despicable behavior, you're witnessing someone choosing to be worse than they could be, acting without honor or basic decency.