Knightly

Adjective

 * 1) Formally courteous (as a knight); chivalrous, gallant and courtly.

Adverb

 * 1) In the manner of a knight; chivalrously.
 * 2) *1485, Thomas Malory, Le Morte Darthur, Book X:
 * ‘That is full knyghtly spokyn,’ seyde Sir Trystram [...].

Adverbs for Knightly
dauntlessly; intrepidly; courteously; gallantly; invariably; habitually; splendidly; superbly; magnificently; generously; chivalrously; distinctly; eminently; nobly; benevolently; delightfully; charmingly; pleasantly; affably; uncommonly; unusually; exceptionally.

Thesaurus
aristocratic, big, bighearted, bold, bold-spirited, brave, ceremonious, chivalric, chivalrous, courageous, courtly, doughty, ducal, elevated, exalted, formal, gallant, generous, genteel, gentle, gentlemanlike, gentlemanly, great, great of heart, greathearted, handsome, hardy, heroic, herolike, high, high-minded, idealistic, intrepid, ironhearted, kinglike, kingly, knightlike, ladylike, largehearted, liberal, lionhearted, lofty, magnanimous, manful, manly, noble, noble-minded, of gentle blood, of rank, old-fashioned, old-world, openhanded, patrician, princelike, princely, queenlike, queenly, quite the lady, soldierlike, soldierly, stalwart, stout, stouthearted, sublime, titled, valiant, valorous

Etymology
From.

Adjective

 * German: