underwhelm

UK: /ˌʌndəˈwɛlm/ US: (un′dər hwelm′, -welm′)

WordReference Random House Unabridged Dictionary of American English © 2026

un•der•whelm  (un′dər hwelm′, -welm′), v.t. [Informal.]

1. Informal Terms to fail to interest or astonish:
   After all the ballyhoo, most critics were underwhelmed by the movie.

• under- + (over)whelm 1945–50

Collins Concise English Dictionary © HarperCollins Publishers::

underwhelm / ˌʌndəˈwɛlm/ verb

1. (transitive) to make no positive impact or impression on; disappoint

Etymology: 20th Century: originally a humorous coinage based on overwhelm