The Collaborative International Dictionary of English v.0.48:

Maidenly \Maid"en*ly\, a.
   Like a maid; suiting a maid; maiden-like; gentle, modest,
   reserved.
   [1913 Webster]

         Must you be blushing ? . . .
         What a maidenly man-at-arms are you become ! --Shak.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Maidenly \Maid"en*ly\, adv.
   In a maidenlike manner. "Maidenly demure." --Skelton.
   [1913 Webster]

WordNet (r) 3.0 (2006):

maidenly
    adj 1: befitting or characteristic of a maiden; "a maidenly
           blush" [syn: maidenlike, maidenly]

Moby Thesaurus II by Grady Ward, 1.0:

79 Moby Thesaurus words for "maidenly":
   Platonic, abstinent, bachelorlike, beardless, boyish, boylike,
   calflike, callow, celibate, childish, childlike, coltish,
   continent, dewy, distaff, ever-new, evergreen, female, feminine,
   firsthand, fledgling, fresh, gentlewomanlike, girlish, girllike,
   green, gynecic, gynecoid, gynic, husbandless, immature, intact,
   kiddish, kittenish, ladylike, little-girlish, maiden, matronal,
   matronlike, matronly, muliebral, neoteric, nestling, new,
   old-maidish, original, petticoat, pristine, puerile, puplike,
   puppyish, puppylike, raw, sempervirent, single, sole, spinsterish,
   spinsterlike, spinsterly, spouseless, unbeaten, undeveloped,
   unfledged, unhandled, unmarried, untouched, untried, untrodden,
   unused, unwed, unwedded, vernal, vestal, virgin, virginal,
   womanish, womanlike, womanly, young