base
the treasure he had basely stolen from us
How can people behave so basely?
The basely self-interested motives of the main players seldom approach the nobility associated with epic heroism.
From a basely partisan viewpoint, the player's injury is good news for England.

SMART Vocabulary: related words and phrases

Morally wrong and evil
abhorrent
abhorrently
amoral
amorality
anomie
dissolute
dissolutely
dissoluteness
enormity
evil
nefariousness
no goodidiom
no more Mr Nice Guyidiom
non-ethical
obscene
trespass
turpitude
unconscionable
unconscionably
unethical