Unprincipled (adjective)

Lacking moral principles or standards.

Origin:

Late 18th century; formed from the prefix un- and the noun "principle".

Examples:

1. He was criticized for his unprincipled behavior.
2. The company was accused of unprincipled business practices.
3. The politician's unprincipled actions cost him the election.
4. The unprincipled thief stole from the elderly.
5. The unprincipled man was willing to do anything to get ahead.