Immoral, evil (3)
I believe the answer is:
bad
This clue is a double definition.
'immoral' is the first definition.
(synonyms)
'evil' is the second definition.
(similar in meaning)
(Other definitions for bad that I've seen before include "Harmful" , "Spoiled or evil" , "Rotten, evil" , "Mouldy, off" , "Stinking" .)