Definition of gratuitous adjective from the Oxford Advanced Learner's Dictionary

 

gratuitous

 adjective
adjective
BrE BrE//ɡrəˈtjuːɪtəs//
 
; NAmE NAmE//ɡrəˈtuːɪtəs//
 
(disapproving)
 
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done without any good reason or purpose and often having harmful effects synonym unnecessary gratuitous violence on television It was a completely gratuitous insult which the singer’s agent was forced to apologize for. Word Origin mid 17th cent.: from Latin gratuitus ‘given freely, spontaneous’ + -ous.
See the Oxford Advanced American Dictionary entry: gratuitous