Adjective unkind has 4 senses
- unkind - lacking kindness; "a thoughtless and unkind remark"; "the unkindest cut of all"
Antonyms: kind, benignant, gracious, benign, charitable, kindly, sympathetic, large-hearted, gentle, kindhearted
- pitiless, unkind - deficient in humane and kindly feelings
Antonym: humane (indirect, via inhumane)
- cruel, unkind - lacking or showing kindness or compassion or mercy
Antonym: hearted (indirect, via heartless)
- brutal, cruel, harsh, rigorous, unkind - used of circumstances (especially weather) that cause suffering; "brutal weather"; "northern winters can be cruel"; "a cruel world"; "a harsh climate"; "a rigorous climate"; "unkind winters"
Antonym: soft (indirect, via hard)
,