The Collaborative International Dictionary of English v.0.48:

Lounger \Loun"ger\, n.
   One who lounges; an idler.
   [1913 Webster]

WordNet (r) 3.0 (2006):

lounger
    n 1: someone who wastes time [syn: dallier, dillydallier,
         dilly-dallier, mope, lounger]
    2: an armchair whose back can be lowered and foot can be raised
       to allow the sitter to recline in it [syn: recliner,
       reclining chair, lounger]
    3: an article of clothing designed for comfort and leisure wear

Moby Thesaurus II by Grady Ward, 1.0:

35 Moby Thesaurus words for "lounger":
   clock watcher, dallier, dawdle, dawdler, diddler, dillydallier,
   do-nothing, dolittle, doodler, faineant, gentleman of leisure,
   goldbrick, goldbricker, goof-off, idler, laggard, lingerer, loafer,
   loiterer, loller, lotus-eater, lubber, mope, moper, potterer,
   putterer, slouch, sloucher, slug, sluggard, stick-in-the-mud,
   time killer, time waster, trifler, waiter on Providence