- atonic, unaccented - used of syllables; "an atonic syllable carries no stress"
- unstressed, unaccented - not bearing a stress or accent; "short vowels are unstressed"
- 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"
Antonym: stressed (indirect, via unstressed)