Definitions

1. adjective

unfriendly or uncooperative in manner or character; not sociable

“She was always unsocial at parties, preferring to sit alone.”

2. noun

a person who is unfriendly or uncooperative in manner or character

“The unsocial neighbors complained about the noise.”

3. adverb

in an unsocial or unfriendly manner

“He works unsocial hours, often late at night.”