Words with Suffix “--лет-ни-ми” in Russian

The word 'восемнадцатилетними' is an eighteen-year-old adjective in the instrumental plural case. It is syllabified into eight syllables following the vowel nucleus rule, with consonant clusters forming closed syllables. The primary stress falls on the seventh syllable ('ни'). The word's morphemic structure reveals its formation from a numeral base, the root 'лет' (year), and adjectival suffixes.