nonsyllabic

adjective

1. not forming a syllable or the nucleus of a syllable; consisting of a consonant sound accompanied in the same syllable by a vowel sound or consisting of a vowel sound dominated by other vowel sounds in a syllable (as the second vowel in a falling diphthong)

   adj.all

   Examples

   The nonsyllabic `n' in `botany' when it is pronounced `botny'.

   The nonsyllabic `i' in `oi'.

   Synonyms unsyllabic

   Source: WordNet 3.0

2. (of speech sounds) not forming or capable of forming the nucleus of a syllable

   adj.all

   Examples

   Initial 'l' in 'little' is nonsyllabic.

   Antonyms syllabic

   Source: WordNet 3.0