unstressed

[uhn-strest]
adjective
1.
without 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.

Origin:
1880–85; un-1 + stress + -ed2

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World English Dictionary
unstressed (ʌnˈstrɛst)
 
adj
1.  carrying relatively little stress; unemphasized
2.  phonetics of, relating to, or denoting the weakest accent in a word or breath group, which in some languages, such as English or German, is also associated with a reduction in vowel quality to a centralized (i) or (a)
3.  prosody (of a syllable in verse) having no stress or accent

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Example sentences
For example, in various parts of the region they tend not to turn vowels in
  unstressed syllables into neutral vowels.
Previous research has shown that unstressed mice enjoy swimming, while stressed
  ones do not.
Past and present, sharply separated by the chapter structure, are fused in
  motifs and unstressed parallels.
He recently found that stressed rats have a stronger, more immediate immune
  response than unstressed animals.
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