ebonite

abusive, acrimonious, disagreeable, hateful, ill-natured, ill-tempered, malevolent, malicious, mean, rancorous, spiteful, surly, virulent

barbarous, bestial, brutal, brutish, cruelue'>, tough, ungentle

abusive, acrimonious, disagreeable, hateful, ill-natured, ill-tempered, malevolent, malicious, mean, rancorous, spiteful, surly, virulent

barbarous, bestial, brutal, brutish, cruel