adv. Forms: see prec.: also 4 traytoures-, traytoursliche, traitoursly, 5 traytorsly, 5–6 -toursly. [app. f. TRAITOROUS a. + -LY2, but exemplified somewhat earlier; perhaps after OF. traitreusement, var. of traiteusement (13–14th c. in Hatz.-Darm.).] In a traitorous or treacherous manner; treacherously.
c. 1330. R. Brunne, Chron. Wace (Rolls), 14360. Conan his cosyn þere hym slew Treterously.
1387. Trevisa, Higden (Rolls), I. 151. Þe firste Amazones were þe wyfes of Gothes, þat took wretche of hire housbondes deþ þat were traytouresliche i-slawe.
1388. Wyclif, Ecclus. xxxii. 19. He that doith tretourousli, schal be sclaundrid ther ynne.
1491. Act 7 Hen. VII., c. 15. Certeyn persones … traiterously murdred … John Mountague late Erle of Sarum.
1512. Act 4 Hen. VIII., c. 20. Preamble, John Tayler felonsly and traytoursly resetted one Archbold Armestrong.
1601. Shaks., All’s Well, IV. iii. 339. You that haue so traitorously discouerd the secrets of your army.
1617. Moryson, Itin., III. 278. The Prince of Orange … was in the yeere 1584 traiterously slaine.
1792. Anecd. W. Pitt, I. vi. 152. Those who have traiterously conspired to rob him of his crown.
1867. Freeman, Norm. Conq., I. v. 347. The very enemy with whom he had before traitorously leagued himself.
