different between chivalrous vs gentlemanly

English

From Middle English chevalrous, from Old French chevalerous; see chivalry.

chivalrous (comparative more chivalrous, superlative most chivalrous)

(of a man) Honourable, especially to women; gallant.
- 1859, George Meredith, The Ordeal of Richard Feverel, Chapter 5:
  Among boys there are laws of honour and chivalrous codes, not written, or formally taught, but intuitively understood by all, and invariably acted upon by the loyal and the true.
involving chivalry.

From gentleman +? -ly.

gentlemanly (comparative more gentlemanly, superlative most gentlemanly)

Of, being, pertaining to, or resembling a gentleman or gentlemen.
- 2010, Catherine Rampell, “In Law Schools, Grades Go Up, Just Like That”, in The New York Times, 2010 June 22, page A1:
  Some schools bump up everyone’s grades, some just allow for more As and others all but eliminate the once-gentlemanly C.

gentlemanly (comparative more gentlemanly, superlative most gentlemanly)

Send