gratuitous
adjective disapproving uk/ɡrəˈtʃuː.ɪ.təs/ us/ɡrəˈtuː.ə.t̬əs/
（不良行为等）不必要的，无谓的，无理由的
(of something such as bad behaviour) not necessary, or with no cause
A lot of viewers complained that there was too much gratuitous sex and violence in the film. 很多观众抱怨说影片中有太多无谓的色情和暴力镜头。