1. (adj) indefensible, insupportable, unjustifiable, unwarrantable, unwarranted
incapable of being justified or explained
Synonyms: unjustifiable, groundless, unwarrantable, baseless, unfounded, undue, wild, insupportable, unjustified, unwarranted, indefensible, idle, untenable
Antonyms: supported, reasonable, sensible, excusable
2. (adj) baseless, groundless, idle, unfounded, unwarranted, wild
without a basis in reason or fact
Synonyms: insupportable, jobless, gaga, raging, violent, untamed, unfounded, unwarrantable, dead, out of work, hazardous, tempestuous, undue, indefensible, godforsaken, dotty, unjustified, uncivilised, uncivilized, waste, baseless, risky, angry, idle, wild, savage, fantastic, barbarian, unjustifiable, crazy, raving mad, unused, groundless, barbaric, furious, light, unwarranted, loose
Antonyms: sensible, supported, excusable, reasonable
3. (adj) undue, unjustified, unwarranted
lacking justification or authorization
Synonyms: unjustifiable, excessive, groundless, unwarrantable, baseless, inordinate, unreasonable, wild, indefensible, insupportable, unjustified, undue, unwarranted, idle, unfounded
Antonyms: supported, sensible, excusable, reasonable
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Synonyms and Antonyms of unwarranted 
