Synonyms of gratuitous

Adjective

1. gratuitous, unmerited (vs. merited)

usage: without cause; "a gratuitous insult"

2. complimentary, costless, free, gratis(predicate), gratuitous, unpaid (vs. paid)

usage: costing nothing; "complimentary tickets"; "free admission"

3. gratuitous, needless, uncalled-for, unnecessary (vs. necessary), unneeded

usage: unnecessary and unwarranted; "a strikers' tent camp...was burned with needless loss of life"

Definition and meaning of gratuitous (Dictionary)