Gratuitous

/ɡrəˈtjuː.ɪ.təs/ adjective medium

Done or given without any real justification or necessity; uncalled for.

Critics complained that the film's violence was gratuitous, adding nothing to the plot or characters.

Memory Trick

Gratuitous shares a root with 'gratis,' meaning free — something gratuitous gets thrown in for free, without being earned or truly needed.