Bastard is an insulting word which some people use about a person, especially a man, who has behaved very badly.

Some people say things such as lucky bastard or poor bastard to refer to a person, usually a man, who they think is very lucky, or very unlucky.

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.

If someone describes a problem or a situation as a bastard, they mean that it is extremely annoying or difficult to deal with.