Why do people say "over-" and "underwhelmed" but never just "whelmed"?

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Music by Eric Matyas
https://www.soundimage.org
Track title: Underwater World

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Chapters
00:00 Why Do People Say &Quot;Over-&Quot; And &Quot;Underwhelmed&Quot; But Never Just &Quot;Whelmed&Quot;?
00:35 Accepted Answer Score 34
00:59 Answer 2 Score 17
01:59 Answer 3 Score 1
02:18 Thank you

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Full question
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Tags
#meaning

#avk47