born out of wedlock;
"the dominions of both rulers passed away to their spurious or doubtful offspring"
of no value or worth;
"I was caught in the bastardly traffic"
- I wished he had never played his bastardly tricks.
- He's a real bastard, leaving his wife in that way.
- I'll get you for that, you bastard!
- An illegitimate child; a bastard.
- "Had I been born in a royal family," said the bastardly man.
- The bastardly documents failed to deceive the judge.