gentlemanlike

from WordNet (r) 3.0 (2006)

gentlemanlike
    adj 1: befitting a man of good breeding; "gentlemanly behavior"
           [syn: {gentlemanlike}, {gentlemanly}]

from The Collaborative International Dictionary of English v.0.48

Gentlemanlike \Gen"tle*man*like`\, Gentlemanly \Gen"tle*man*ly\,
   a.
   Of, pertaining to, resembling, or becoming, a gentleman;
   befitting a man of good breeding; well-behaved; courteous;
   polite; as, gentlemanly behavior.
   [1913 Webster]