The Collaborative International Dictionary of English v.0.48:

Loiter \Loi"ter\, v. i. [imp. & p. p. Loitered; p. pr. & vb.
   n. Loitering.] [D. leuteren to delay, loiter; cf; Prov. G.
   lottern to be louse, lotter louse, slack, unsettled, vagrant,
   OHG. lotar.]
   1. To be slow in moving; to delay; to linger; to be dilatory;
      to spend time idly; to saunter; to lag behind.
      [1913 Webster]

            Sir John, you loiter here too long.   --Shak.
      [1913 Webster]

            If we have loitered, let us quicken our pace.
                                                  --Rogers.
      [1913 Webster]

   2. To wander as an idle vagrant. [Obs.] --Spenser.

   Syn: To linger; delay; lag; saunter; tarry.
        [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

59 Moby Thesaurus words for "loitering":
   Micawberish, backward, coquetry, dabbling, dalliance, dallying,
   dawdling, delaying, dilatoriness, dilatory, dillydallying,
   dolce far niente, dragging, easygoing, fiddling, flirtation,
   fooling, fooling around, foot-dragging, goofing off, idling,
   jerking off, kidding around, lackadaisical, lag, laggard, lagging,
   lax, lazing, lazy, lingering, loafing, lolling, lollygagging,
   lounging, messing around, monkeying, monkeying around, mopery,
   piddling, playing, playing around, pottering, procrastinating,
   procrastination, procrastinative, procrastinatory, puttering,
   remiss, shilly-shallying, shuffling, slack, slow, sluggish,
   smattering, tarrying, tinkering, toying, trifling