unvocal (adjective) inarticulate: unable to speak well
Sinonime: blurred,
dumb, faltering, halting,
hesitant, hesitating, inaudible,
incoherent,
incomprehensible,
indistinct, maundering, muffled, mumbled, mumbling,
mute,
obscure,
reticent,
silent,
speechless, stammering, tongue-tied,
unclear, unintelligible, unspoken, unuttered, unvocal, unvoiced,
vague, voiceless, wordless
Antonime: articulate, communicative