1. bastard, by-blow, love child, illegitimate child, illegitimate, whoreson, offspring, progeny, issue

usage: the illegitimate offspring of unmarried parents

2. asshole, bastard, cocksucker, dickhead, shit, mother fucker, motherfucker, prick, whoreson, son of a bitch, SOB, unpleasant person, disagreeable person

usage: insulting terms of address for people who are stupid or irritating or ridiculous

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See also: whoreson (Dictionary)