Synonyms for bastard

modified

1. Born out of wedlock

   illegitimate, natural, fatherless; see illegitimate 2.

2. Of dubious extraction

   false, adulterated, spurious; see false 3, impure 1, mixed 1.

noun

1. An illegitimate child

   illegitimate child, natural child, spurious issue, whoreson, love child, child born out of wedlock, nullius filius (Latin), Sunday's child*.

2. A rascal

   scoundrel, ne'er-do-well, cheat, rascal, son of a bitch* or SOB*, stinker*, rat*, fink*, ratfink*, heel*; see also rascal.