the.com/cavalier

Confidence that skipped the step where it checks if it's right.

means Showing a careless, offhand disregard for something that probably deserved more thought or respect.

from From Latin caballus, 'horse,' which gave Italian cavaliere and French chevalier — a mounted, armed gentleman. In English 'Cavalier' became the name for the swaggering, royalist, sword-at-hip supporters of Charles I during the English Civil War, as opposed to the sober Roundheads. Their reputation for dash, swagger, and disdain for caution curdled the word into its modern sense: breezy confidence that never pauses to check if it's earned.

origin
from mounted knight, same root as chivalry
shift
horsemen's swagger curdled into recklessness by 1600s
usage tell
always describes the careless, never the careful
bonus
also a dog breed and an NBA team, both dashing
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