The opposite of overwhelming. Usually uneventful and nothing special. Often associated with mediocrity.
Friend one: Hey have herd this new band called (shitty band name)?

Friend two: No. Should I?

Friend one: Nah, they're pretty underwhelming.
by Hufty March 30, 2010
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unimpressed, unmoved, disappointed by lack of cerebral prowess or performance, failure to meet expectations, failure to provide evidence to support arguments
His performance did not wow me at all, I was totally underwhelmed.
by go big or go home January 1, 2004
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