Is “furthermore” associated with AI writing?
Moderately associated with AI writing for the same reason as “moreover”: heavy over-selection as a paragraph starter.
Why it sounds artificial
It's formal glue that modern human prose mostly dropped. One instance is fine; as a recurring paragraph opener it reads as generated.
What to say instead of “furthermore”
Example rewrite
Furthermore, the study included a control group.
The study also included a control group.
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