inarticulate
Definitions
Unable to speak distinctly or express oneself clearly.
Lacking the ability to express ideas or feelings in coherent words.
Not uttered or expressed in distinct syllables or words.
Examples
He became completely inarticulate with rage and could not explain what had happened.
The nervous student gave an inarticulate response when the teacher asked him to summarize the complex theory.
Synonyms
tongue-tied incoherent speechless unspoken mumbled halting vague
Antonyms
articulate eloquent fluent expressive coherent vocal articulated