1590s, from well (adv.) + past participle of behave (v.).
a well-behaved child
well
well-acquainted
well-adjusted
wellaway
well-balanced
well-behaved
well-being
well-beloved
well-born
well-bred
well-done
)window.location='https://www.paypal.com/cgi-bin/webscr?cmd=_donations&business=byronic106@yahoo.com&lc=US&item_name=Donation+to +Help+Keep+Etymonline+Free+and+Open&no_note=0&cn=&curency_code=USD&bn=PP-DonationsBF:btn_donateCC_LG.gif:NonHosted'){kind=link}