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1.
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.
de go big or go home 1 janvier 2004
 
2.
Antonym of overwhelmed.
I was underwhelmed with the new vacation spot.
de geogoldman 1 juin 2009