Inarticulate

Adjective

 * 1)  not articulated in normal words
 * 2) speechless
 * 3) unable to speak with any clarity
 * 4)  not having joints or other articulations

Adverbs for Inarticulate
unfortunately; diffidently; shyly; awkwardly; timidly; gruffly; ridiculously; ludicrously; extremely; taciturnly; heavily; stammeringly; tremulously; stiffly; gawkishly; silently; laconically; curtly; reticently; reservedly; gravely; bewilderingly; strangely; unwisely.

Thesaurus
Greek to one, ambiguous, anaudic, aphasic, aphonic, bashful, beyond understanding, blurred, breathless, breathy, choked, choking, confused, conscious, coy, croaking, demure, digressive, discursive, disjointed, drawling, drawly, dumb, dumbfounded, dumbstricken, dumbstruck, dysphonic, faltering, garbled, guttural, halting, harsh, hawking, hesitating, hoarse, illogical, impenetrable, implicit, implied, incognizable, incoherent, incomprehensible, indistinct, inferred, inscrutable, irrational, jumbled, lisping, maundering, mispronounced, mixed-up, mousy, muddled, muffled, mum, mumbled, mumbling, mute, muzzy, nasal, numinous, past comprehension, quavering, rambling, scrambled, self-conscious, shaking, shaky, shamefaced, shamefast, shy, silent, skittish, snuffling, speechless, stammering, stifled, strangled, stricken dumb, thick, throaty, timid, timorous, tongue-tied, tongueless, tremulous, twangy, unclear, unconnected, undeclared, unexpressed, unfathomable, unintelligible, unknowable, unsaid, unsearchable, unspoken, unuttered, velar, voiceless, wild, wordless