So great was it, that in a voice inarticulate with rage, with a stammering tongue, and eyes that flashed living fire, he exclaimed, "Rascally clown, boorish, insolent, and ignorant, ill-spoken, foul-mouthed, impudent backbiter and slanderer!
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She becomes inarticulate when she’s nervous.
She seemed uninformed and inarticulate compared to her opponent in the debate.