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Use "roundedness" in a sentence
"He's seeking merit scholarships from several colleges, including music and other activities to emphasize his well-roundedness."
"She was clad, not in the single white silk slip she evidently wore only for girl parties, but in a coquettish imitation of the prevailing fashion mode, a suit of changeable light blue and green silk — almost the color of the pool; the skirt slightly above the knees whose roundedness he recognized; with long stockings to match, and tiny bathing shoes bound on with crossed ribbons."
"Kids do best when they are allowed to develop deep passions and pursue them wholeheartedly — at the expense of well-roundedness."