unprincipled

Lacking principles or moral scruples; unscrupulous.

Not having settled principles; not grounded in principle.

Having no sound moral principles; destitute of virtue; not restrained by conscience; profligate; immoral.

Not resulting from good principles; iniquitous; wicked.

Being without principles; especially, being without right moral principles; also, characterized by absence of principle.

lacking moral values

having little or no integrity

lacking principles or moral scruples