Ashamed (adjective)

1. Feeling guilty, embarrassed, or unworthy because of one's actions, characteristics, or associations.
2. Feeling regret or disappointment about something that one has or has not done.

Origin:

Old english æscamod, of germanic origin; related to middle low german ēschen "ashy" and middle high german eschamen "to be ashamed".

Examples:

1. I'm ashamed of my behavior at the party.
2. I"m ashamed to admit that I didn"t vote.
3. He was ashamed of his accent and tried to hide it.
4. She was ashamed of her poverty and tried to hide it.
5. He felt ashamed of his failure and didn't tell anyone.