UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈʌnˈstrest/US:USA pronunciation: respellingUSA pronunciation: respelling(un strest)

WordReference Random House Unabridged Dictionary of American English © 2020
un•stressed  (un strest),USA pronunciation adj. 
  1. Phoneticswithout stress or emphasis, as a syllable in a word.
  2. not receiving or subjected to stress, wear, etc.:the unstressed parts of a car body.
  • un-1 + stress + -ed2 1880–85

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