bravery (n.)youdaoicibaDictYouDict[bravery 词源字典]
1540s, "daring, defiance, boasting," from French braverie, from braver "to brave" (see brave) or else from cognate Italian braveria, from bravare.
No Man is an Atheist, however he pretend it and serve the Company with his Braveries. [Donne, 1631]
As a good quality, attested from 1580s. Meaning "fine clothes" is from 1560s and holds the older sense.[bravery etymology, bravery origin, 英语词源]
knavery (n.)youdaoicibaDictYouDict
1520s, from knave + -ery.
pro-slavery (adj.)youdaoicibaDictYouDict
1825, from pro- + slavery.
slavery (n.)youdaoicibaDictYouDict
1550s, "severe toil, hard work, drudgery;" from slave (v.) + -ery. Meaning "state of servitude" is from 1570s; meaning "keeping or holding of slaves" is from 1728.