underwhelm verb to arouse little or no interest in someone UK,1956 Jocular. Now included in the OxfordEnglishDictionary.
Cautious Canada underwhelmed by [Prince] Charles’s visit — The Guardian, 26 April 2001
I was the first person to say “young fogey” and “underwhelmed” but you don’t get any credit for that. Neither are in the Oxford English Dictionary[.] — Word, p. 54, September 2004