UNDERWHELM Meaning of UNDERWHELM in English underwhelm BrE AmE ˌʌnd ə ˈwelm -ˈhwelm AmE \ - ə r-▷ underwhelm|ed d▷ underwhelm|ing ɪŋ▷ underwhelm|s z Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012