n. 25B6; noun
(historical) Cavaliers dying for King Charles : ROYALIST, king's man.
(archaic) the lady and her cavalier : ESCORT, gentleman; dated beau.
(archaic) foot soldiers and cavaliers : HORSEMAN, equestrian; cavalryman, trooper, knight.
Roundhead.
25B6; adjective a cavalier disregard for danger : OFFHAND, indifferent, casual, dismissive, insouciant, unconcerned; supercilious, patronizing, condescending, disdainful, scornful, contemptuous; informal couldn't-care-less.