Knightly

[AS. cnihtlic boyish.]
Of or pertaining to a knight; becoming a knight; chivalrous; as, a knightly combat; a knightly spirit.

For knightly jousts and fierce encounters fit.

[Excuses] full knightly without scorn.

Knight·ly
adv.

In a manner becoming a knight.

And why thou comest thus knightly clad in arms.

adjective

Characterized by elaborate but usually formal courtesy: chivalrous, courtly, gallant, gracious, stately. See attitude/good attitude/bad attitude/neutral attitude, courtesy/discourtesy.

Definition: gallant
Antonyms: cowardly, ignoble, ungallant

adj

Definition: upper-class
Antonyms: common, low-born

The adjective has 2 meanings:

Meaning #1: characteristic of the time of chivalry and knighthood in the Middle Ages
  Synonyms: chivalric, medieval

Meaning #2: having the qualities of gallantry attributed to an ideal knight
  Synonyms: chivalrous, gallant