different between unaccented vs amphimacer

English

un- +? accented

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.

Of Ancient Greek origin, meaning "long at both sides"; see amphi-, macro-.

amphimacer (plural amphimacers)

A metrical foot consisting of an unaccented syllable between two accented syllables; a cretic

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