Slow-witted and inarticulate; dull of mind and clumsy of speech.
他从小就心拙口夯，不爱与人交谈，但做事却非常踏实。
He has been slow-witted and inarticulate since childhood, not fond of conversing with others, but very diligent and reliable in his work.
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Slow-witted and inarticulate; dull of mind and clumsy of speech.