medieval vs knightly

medieval and knightly both are adjectives.

Word	Noun	Adjective	Verb	Adverb
medieval	No	Yes	No	No
knightly	No	Yes	No	No

As adjectives, medieval and knightly are synonyms defined as:

medieval and knightly: characteristic of the time of chivalry and knighthood in the Middle Ages

Other synonyms of medieval include chivalric, mediaeval.

medieval (adjective)	knightly (adjective)
relating to or belonging to the Middle Ages	being attentive to women like an ideal knight
as if belonging to the Middle Ages; old-fashioned and unenlightened	characteristic of the time of chivalry and knighthood in the Middle Ages
characteristic of the time of chivalry and knighthood in the Middle Ages