1. bastardly, misbegot, misbegotten, spurious, illegitimate (vs. legitimate)

usage: born out of wedlock; "the dominions of both rulers passed away to their spurious or doubtful offspring"- E.A.Freeman

2. bastardly, mean, contemptible (vs. estimable)

usage: of no value or worth; "I was caught in the bastardly traffic"

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See also: bastardly (Dictionary)