unkind(adjective) adjective1. lacking kindness- a thoughtless and unkind remark- the unkindest cut of allSimilar word(s): malign, cutting, edged, stinging, harsh, rough, hurtful, unkindly, unsympathetic, merciless, unmerciful2. deficient in humane and kindly feelingsSimilar word(s): inhumane, pitiless