Old English deopnes "deep water," also "a mystery or secret;" see deep (adj.) + -ness. From late 12c. as "distance downward;" c. 1200 as "wisdom, profundity."
deep
deep six
deepen
deep-freeze
deeply
deepness
deep-sea
deep-seated
deep-set
deer
deerskin
)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}