Definition of underwhelm in English:

underwhelm

Syllabification: un·der·whelm
Pronunciation: /ˌəndərˈ(h)welm
 
/

verb

[with object] (usually be underwhelmed) • humorous
  • Fail to impress or make a positive impact on (someone); disappoint: American voters seem underwhelmed by the choices for president
    More example sentences
    • It had been a year since the last time I ventured in, however, and when I ate here last month, I must confess I was underwhelmed by the experience.
    • I get the distinct impression Adam wanted me to be elated; I'm underwhelmed.
    • I was rather underwhelmed by his responses, and disappointed that I didn't feel more challenged.

Origin

1950s: suggested by overwhelm.

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