English pronunciation of “underneath”

underneath

uk How to pronounce underneath preposition in British English
us How to pronounce underneath preposition in American English
uk How to pronounce underneath noun in British English
us How to pronounce underneath noun in American English
us How to pronounce underneath adjective in American English

(English pronunciations of “underneath” from the Cambridge Advanced Learner’s Dictionary & Thesaurus and from the Cambridge Academic Content Dictionary, both sources © Cambridge University Press)