a person born of unmarried parents; an illegitimate child.

Slang .

a vicious, despicable, or thoroughly disliked person

Some bastard slashed the tires on my car.

a person, esp. a man

The poor bastard broke his leg.

something irregular, inferior, spurious, or unusual.

bastard culverin.

illegitimate in birth.

spurious; not genuine; false

The architecture was bastard Gothic.

of abnormal or irregular shape or size; of unusual make or proportions

bastard quartz; bastard mahogany.

having the appearance of; resembling in some degree

a bastard Michelangelo; bastard emeralds.

Printing . (of a character) not of the font in which it is used or found.

adjective

legitimate

adjective

adulterated , baseborn , counterfeit , fake , false , imperfect , impure , inferior , irregular , misbegotten , misborn , mixed , mongrel , natural , phony , sham , spurious , suppositious , ungenuine , unlawful , adulterine , debased , illegitimate , sinister , supposititious