Webster's Revised Unabridged Dictionary · 1913

Knightly

Knightly , adjective

[Anglo-Saxon 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. — Spenser
[Excuses] full knightly without scorn. — Tennyson

Knightly , adverb

In a manner becoming a knight.
And why thou comest thus knightly clad in arms. — Shakespeare