bastard

bas|tard /b'ɑːstərd, b'æs-/ (bastards)
1 [N-COUNT]
Bastard is an insulting word which some people use about a person, especially a man, who has behaved very badly. (INFORMAL, VERY RUDE)
2 [N-COUNT] oft N n
A bastard is a person whose parents were not married to each other at the time that he or she was born. This use could cause offence. (OLD-FASHIONED)