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Use "buttoned-down" in a sentence
"They are a clean-cut, happy-looking couple in their fifties who are decidedly less buttoned-down than the other professionals in the group."
"He had the distinguished look of a buttoned-down, wealthy tycoon who fed his rebellious streak in the shadowy edges of his life."
"My company was way less buttoned-down and closed-mouth than most, so the problem wasn't them, but me; I'd sucked down enough of the Kool-Aid by my mid-twenties to keep lots of myself under wraps and behind the veil, the way most corporate people do -- a stupid waste of creativity and human power."