While the mate was getting the hammer, Ahab, without speaking, was slowly rubbing the gold piece against the skirts of his jacket, as if to heighten its lustre, and without using any words was meanwhile lowly humming to himself, producing a sound so strangely muffled and inarticulate that it seemed the mechanical humming of the wheels of his vitality in him.
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She becomes inarticulate when she’s nervous.
She seemed uninformed and inarticulate compared to her opponent in the debate.