The Collaborative International Dictionary of English v.0.48:

Roomy \Room"y\, a.
   Having ample room; spacious; large; as, a roomy mansion; a
   roomy deck. --Dryden.
   [1913 Webster]

WordNet (r) 3.0 (2006):

roomy
    adj 1: (of buildings and rooms) having ample space; "a roomy but
           sparsely furnished apartment"; "a spacious ballroom"
           [syn: roomy, spacious]
    n 1: an associate who shares a room with you [syn: roommate,
         roomie, roomy]

Moby Thesaurus II by Grady Ward, 1.0:

60 Moby Thesaurus words for "roomy":
   aerial, aeriform, aery, airish, airlike, airy, alfresco, ample,
   amplitudinous, atmospheric, big, breezy, broad, capacious,
   comfortable, comfy, commodious, contented, convenient, cozy,
   cushioned, cushiony, cushy, deep, easeful, easy, ethereal,
   expansive, exposed, extended, extending, extensive, far-reaching,
   friendly, full, homelike, homely, homey, infinite, large, light,
   lived-in, luxurious, open-air, peaceful, pneumatic, relaxing,
   reposeful, restful, sizeable, snug, soft, spacious, spreading,
   tropospheric, vast, voluminous, warm, wide, widespread