inarticulate

The definition of inarticulate is something or someone lacking clarity of speech.

(adjective)

A person who fumbles over his words and cannot explain himself is an example of someone who would be described as inarticulate.

See inarticulate in Webster's New World College Dictionary

adjective

produced without the normal articulation of understandable speech: said of vocal sounds: an inarticulate cry
1. not able to speak, as because of strong emotion; mute
2. not able to speak understandably, effectively, or coherently
not expressed or able to be expressed: inarticulate passion
Zool. without joints, segments, hinges, or valves

Origin: LL inarticulatus: see in- & articulate

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See inarticulate in American Heritage Dictionary 4

adjective

Uttered without the use of normal words or syllables; incomprehensible as speech or language: “a cry . . . that . . . sank down into an inarticulate whine” (Jack London).
Unable to speak; speechless: inarticulate with astonishment.
Unable to speak with clarity or eloquence: an inarticulate debater.
Going unexpressed: inarticulate sorrow.
Biology Not having joints or segments.

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