BASTARDLY
especially of a person, or his or her behaviour, etc.: like (that of) a bastard; specifically wilfully cruel, callous, or unfeeling.
illegitimately.
in the manner of a bastard; callously, cruelly. also in weakened use as an intensifier: very, extremely.
illegitimately.
in the manner of a bastard; callously, cruelly. also in weakened use as an intensifier: very, extremely.