Having good manners and acting properly(adjective)
(of a function) Having a finite derivative (of all orders) at all points, and having no discontinuities(adjective)
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Use "well-behaved" in a sentence
"The girls are all-American girls – charming, well-behaved but energetic, smart."
"The night after Mr. Johnson picked up his son—finding he was indeed well-behaved—he saw his son's legs were covered with many bites from chiggers, the larvae of mites."
"She was well-behaved, followed Tom around the entire time. and ended up being in three of the print shots we took, Ms. Rishwain said."