gratuitous
gruh-TOO-ih-tusadjMeaning done without good reason; uncalled for
Memory hook GRATIS = for free: and for NO reason. Pip walks by minding his own business, and Rosa calls out “Silly hat!” for no reason at all: the remark is gratuitous.
The movie was spoiled by gratuitous explosions that had nothing to do with the story.
In context Her criticism of his essay was fair, but the gratuitous remark about his handwriting was simply unkind and added nothing.
Similar unnecessary, uncalled-for, unjustified, needless
Opposite justified, necessary, warranted
From Latin gratuitus, “free, done without pay,” from gratia (favor).