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Webster 1828 Edition

Adj.

Not accented; having no accent; as an unaccented syllable.

unaccented ‎(comparative more unaccented, superlative most unaccented)

Of a word, having no diacritical mark; accentless.
Of a vowel or syllable, pronounced with no, or little stress.
Not pronounced with a distinctive accent.
The Frenchman spoke clear, unaccented English.

accentless

pronounced with little or no stress