名詞 bastard:

1. insulting terms of address for people who are stupid or irritating or ridiculous
   同義詞：asshole, cocksucker, dickhead, shit, mother fucker, motherfucker, prick, whoreson, son of a bitch, SOB
2. the illegitimate offspring of unmarried parents
   同義詞：by-blow, love child, illegitimate child, illegitimate, whoreson
3. derogatory term for a variation that is not genuine; something irregular or inferior or of dubious origin
   同義詞：mongrel

形容詞 bastard:

1. fraudulent; having a misleading appearance
   同義詞：bogus, fake, phony, phoney

1. I'll get you for that, you bastard!
   我早晚要跟你算那筆帳，你這壞蛋！
2. You bastard!
   你這雜種！
3. That boy's parents are unmarried, therefore he is a bastard!
   那個男孩的父母未結婚，所以他是私生子。

bas.tard

n.（名詞）
An illegitimate child.
私生子：私生子，不合法的孩子
Something that is of irregular, inferior, or dubious origin.
贗品，冒牌貨：某種假冒的、不正當的、低劣的或來由有問題的東西
Vulgar Slang A person, especially one who is held to be mean or disagreeable.
【粗俗用語】 【俚語】 態(tài)度傲慢且令人討厭的人，自私的人
adj.（形容詞）
Born of unwed parents; illegitimate.
庶子的，私生子的：不經正式婚姻而生的；私生的
Not genuine; spurious:
不真實的；偽造的，假的：
例句：
a bastard style of architecture.
偽造的建筑式樣

Resembling a known kind or species but not truly such.
仿冒品的：與知名品牌相象，但事實并非如此

來源：
Middle English
中古英語
from Old French
源自 古法語
[probably of Germanic origin] ; akin to Old Frisian bôst [marriage]
[可能起源于日耳曼語的] ；類似于 古佛里斯蘭語 bôst [婚姻]

【引伸】
bas.tardly
adj.（形容詞）