Is “last but not least” associated with AI writing?
Moderately associated with AI listicles and speeches-turned-text.
Why it sounds artificial
It's a ceremonial spoken phrase that adds nine syllables of nothing before a final list item.
What to say instead of “last but not least”
Example rewrite
Last but not least, remember to proofread your work.
Finally: proofread. Twice.
Check your own text for “last but not least”
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