said or done without good reason
gratuitous - unnecessary
Something ‘gratuitous’ is regarded as being unnecessary, offensive, and often done simply for shock value or cheap thrills. The word is most commonly used to indicate excessive and inappropriate sex or violence in literature, or in entertainment such as movies, computer games, and television shows.
There is so much gratuitous violence on TV these days. There is a risk that it normalises cruelty and brutality.
I wish Tom would stop looking over my shoulder as I’m working and giving me advice. I never asked for or needed his help, it’s just totally gratuitous.
The journalist wrote an article gratuitously attacking the politician simply to create controversy.