"gratuitous" in the adjective sense
1. gratuitous
without cause
"a gratuitous insult"
2. complimentary, costless, free, gratis, gratuitous
costing nothing
"complimentary tickets"
"free admission"
3. gratuitous, needless, uncalled-for
unnecessary and unwarranted
"a strikers' tent camp...was burned with needless loss of life"
Source: WordNet® (An amazing lexical database of English)
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