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Use "smartness" in a sentence
"But what I lack in smartness and funniness, I more than make up for in cruelty!"
"The smartness is mostly wasted, as I'm sitting at my desk with absolutely nothing to do, wishing I was at home in my pyjamas."
"By discipline, I do not merely mean smartness, which is involved in quick and correct response to the word of command; that, of course, is part of it; but I refer more particularly to that grip of self which enables a man to force himself into subjection to authority, which may be entirely inimical to his own will."