From Longman Dictionary of Contemporary Englishunstressedun‧stressed /ˌʌnˈstrest◂/ AWL adjective an unstressed word or part of a word is pronounced with less force than other ones
Examples from the Corpus
unstressed• Health is described by phrases such as being happy, being unstressed and being able to cope.• I have reproduced the unstressed results from the last chapter for the purposes of comparison.• Three stressed sets of test utterances were included, derived from the corresponding unstressed sets.• These words show very clearly the difficulty of the unstressed syllable. 