cavalierly

adv

1. In a cavalier manner.

   “Louis's brow wore its deepest gloom as he said, "There are few in yonder room who would so cavalierly reject my love."”

   “He had, he felt, treated Mrs Hubbard rather cavalierly.”

   “Far from marking the outer edge of the solar system, as those school-room maps so cavalierly imply, Pluto is barely one fifty-thousandth of the way.”