adj. 25B6; adjective
everyone was being unkind to him : UNCHARITABLE, unpleasant, disagreeable, nasty, mean, mean-spirited, cruel, vicious, spiteful, malicious, callous, unsympathetic, unfeeling, uncaring, hurtful, ill-natured, hard-hearted, cold-hearted; unfriendly, uncivil, inconsiderate, insensitive, hostile; informal bitchy, catty; Brit. informal beastly.
unkind weather : INCLEMENT, intemperate, rough, severe, filthy.