Unchaste (adjective)

Not pure or morally upright; unchaste.

Origin:

From un- (not) + chaste (pure, morally upright).

Examples:

1. He thought her behavior to be unchaste.
2. It's unchaste to engage in premarital sexual activities.
3. The unchaste woman was shunned by the community.
4. The unchaste thoughts made him feel guilty.
5. He was accused of having unchaste relationship with his neighbor's wife.