unprincipled; inconstant; unscrupulous
Describes a person or behavior lacking firm principles, easily changing opinions or acting without moral consistency.
He has an unprincipled attitude and tries to please everyone.
You can't trust someone who changes their opinion without principle.
A compound of 無, “without,” and 節操, “principles, constancy.” The geminate consonant belongs to the established reading せっそう of 節操.