The woman so cavalierly treated in his thoughts of yesterday had become a most sacred and dreadful power.
They approached; I bowed low to the Duke, who returned my salute most cavalierly.
He had acted too cavalierly in this Civic Club mess, he concluded, and yet he would not back down.
"Do not speak so cavalierly of the devil, my old comrade," said the marshal.
But she turned her back on me, she deserted me utterly; I treated her too cavalierly and she bore me ill-will.
But the aristocratic occupants of the boxes treated him cavalierly.
Why had she treated him so well at first, and so cavalierly after dinner?
She whom they all addressed so cavalierly was particular to put a handle to each name.
He has soon something fresh to tell; and it is that young Mr. Harrington is treating him cavalierly.
Are all political rank-and-filers treated as cavalierly as we've been?
1580s, from Italian cavalliere "mounted soldier, knight; gentleman serving as a lady's escort," from Late Latin caballarius "horseman," from Vulgar Latin caballus, the common Vulgar Latin word for "horse" (and source of Italian cavallo, French cheval, Spanish caballo, Irish capall, Welsh ceffyl), displacing Latin equus (see equine).
Sense advanced in 17c. to "knight," then "courtly gentleman" (but also, pejoratively, "swaggerer"), which led to the adjectival senses, especially "disdainful" (1650s). Meaning "Royalist adherent of Charles I" is from 1641. Meaning "one who devotes himself solely to attendance on a lady" is from 1817, roughly translating Italian cavaliere-servente. In classical Latin caballus was "work horse, pack horse," sometimes, disdainfully, "hack, nag." "Not a native Lat. word (as the second -a- would show), though the source of the borrowing is uncertain" [Tucker]. Perhaps from some Balkan or Anatolian language, and meaning, originally, "gelding." The same source is thought to have yielded Old Church Slavonic kobyla.
"disdainful," 1650s, from cavalier (n.). Earlier it meant "gallant" (1640s). Related: Cavalierly.
A skillful boxer as distinct from a slugger or caveman (1920s+ Prizefight)