(rare, colloquial, vulgar, derogatory, offensive) A tendency to act like a bastard (in a despicable manner), said as if it were due to a disease or affliction.

The making of a bastard or bastards; Having children out of wedlock or destroying the legitimacy of children's paternity. / The creation of offspring from two different species; cross-breeding.

(dated) A person who was born out of wedlock, and hence often considered an illegitimate descendant. / A mongrel (biological cross between different breeds, groups or varieties).

Of or like a bastard (illegitimate human descendant). / Of or like a bastard (bad person). / Of or like a mongrel, bastardized creature/cross. / Spurious, lacking authenticity: counterfeit, fake.

(rare) Exclamation of strong dismay or strong sense of being upset.

(obsolete) To bastardize.

simple past tense and past participle of bastardize

To claim or demonstrate that someone is a bastard, or illegitimate. / To reduce from a higher to a lower state, such as by removing refined elements or introducing debased elements; to debase.

A surname from Old French.

plural of bastard