mon ‧ o ‧ syl ‧ lab ‧ ic /ˌmɒnəsɪˈlæbɪk◂ $ ˌmɑː-/ BrE AmE adjective
1 . someone who speaks in a monosyllabic way does not say very much and does not try to be friendly:
He made monosyllabic replies to my questions.
2 . technical a monosyllabic word has only one ↑ syllable