From The Collaborative International Dictionary of English v.0.44 [gcide]:
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.
From WordNet (r) 2.0 [wn]:
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
38 Moby Thesaurus words for "gentlemanly": andric, aristocratic, bull, chivalrous, cultivated, cultured, ducal, exalted, genteel, gentle, gentlemanlike, high, highbred, kinglike, kingly, knightly, ladylike, male, manful, manlike, manly, mannish, masculine, noble, of gentle blood, of rank, patrician, polished, princelike, princely, queenlike, queenly, quite the lady, refined, titled, uneffeminate, well-bred, well-brought-up
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