"unaccented" in the adjective sense
1. atonic, unaccented
used of syllables) carrying no stress
"an atonic syllable carries no stress"
2. unaccented, light, weak
used of vowels or syllables) pronounced with little or no stress
"a syllable that ends in a short vowel is a light syllable"
"a weak stress on the second syllable"
Source: WordNet® (An amazing lexical database of English)
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