lacking the ability to express oneself, esp. in clear and effective speech

an inarticulate public speaker.

unable to use articulate speech

inarticulate with rage.

not articulate; not uttered or emitted with expressive or intelligible modulations

His mouth stuffed, he could utter only inarticulate sounds.

not fully expressed or expressible

a voice choked with inarticulate agony.

Anatomy, Zoology . not jointed; having no articulation or joint.

adjective

articulate , communicative

adjective

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 , aphonic , mum , garbled , inexpressive