[n] derogatory term for a variation that is not genuine; something irregular or inferior or of dubious origin; "the architecture was a kind of bastard suggesting Gothic but not true Gothic"
[n] (obscene) insulting terms of address for people who are stupid or irritating or ridiculous
[n] the illegitimate offspring of unmarried parents
[adj] fraudulent; having a misleading appearance
[adj] born out of wedlock; "the dominions of both rulers passed away to their spurious or doubtful offspring"- E.A.Freeman
asshole, bastardly, bogus, by-blow, cocksucker, counterfeit, dickhead, fake, illegitimate, illegitimate, illegitimate child, imitative, love child, misbegot, misbegotten, mongrel, mother fucker, motherfucker, phoney, phony, prick, shit, SOB, son of a bitc