Closely following a formula or predictable pattern; imitative, not original.(adjective)
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Use "formulaic" in a sentence
"The story could easily have run adrift in formulaic silliness."
"Given the theme of Yotsuba, “Enjoy Everything”, I think it being a little formulaic is be expected."
"The opportunity to be long-winded yet perfunctory, paradoxically daring yet formulaic, is available to only proven hit makers at the top of the heap."