Antonyms of adj unkind

2 senses of unkind

Sense 1
unkind (vs. kind) -- (lacking kindness; "a thoughtless and unkind remark"; "the unkindest cut of all")

kind (vs. unkind) -- (having or showing a tender and considerate and helpful nature; used especially of persons and their behavior; "kind to sick patients"; "a kind master"; "kind words showing understanding and sympathy"; "thanked her for her kind letter")
        => benignant, gracious -- (characterized by kindness and warm courtesy especially of a king to his subjects; "our benignant king")
        => benign -- (kindness of disposition or manner; "the benign ruler of millions"; "benign intentions")
        => charitable, benevolent, kindly, sympathetic, good-hearted, openhearted, large-hearted -- (showing or motivated by sympathy and understanding and generosity; "was charitable in his opinions of others"; "kindly criticism"; "a kindly act"; "sympathetic words"; "a large-hearted mentor")
        => gentle -- (having or showing a kindly or tender nature; "the gentle touch of her hand"; "her gentle manner was comforting"; "a gentle sensitive nature"; "gentle blue eyes")
        => kindhearted, kind-hearted -- (having or proceeding from an innately kind disposition; "a generous and kindhearted teacher")

Sense 2
pitiless, unkind -- (deficient in humane and kindly feelings)

INDIRECT (VIA inhumane) -> humane -- (marked or motivated by concern with the alleviation of suffering)

Similarity of adj unkind

2 senses of unkind

Sense 1
unkind (vs. kind) -- (lacking kindness; "a thoughtless and unkind remark"; "the unkindest cut of all")
       => cutting, edged, stinging -- ((of speech) harsh or hurtful in tone or character; "cutting remarks"; "edged satire"; "a stinging comment")
       => harsh, rough -- (unkind or cruel or uncivil; "had harsh words"; "a harsh and unlovable old tyrant"; "a rough answer")
       => hurtful -- (causing hurt; "her hurtful unconsidered words")
       => unkindly, unsympathetic -- (lacking in sympathy and kindness; "unkindly ancts")
          Also See-> malign#1; merciless#1, unmerciful#1

Sense 2
pitiless, unkind -- (deficient in humane and kindly feelings)
       => inhumane (vs. humane) -- (lacking and reflecting lack of pity or compassion; "humans are innately inhumane; this explains much of the misery and suffering in the world"; "biological weapons are considered too inhumane to be used")