gratuitous

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Adjective gratuitous has 3 senses

gratuitous - without cause; "a gratuitous insult"
Antonym: merited (indirect, via unmerited)
complimentary, costless, free, gratis, gratuitous - costing nothing; "complimentary tickets"
Antonym: paid (indirect, via unpaid)
gratuitous, needless, uncalled-for - unnecessary and unwarranted; "a strikers' tent camp...was burned with needless loss of life"
Antonym: necessary (indirect, via unnecessary)