The Collaborative International Dictionary of English v.0.48:

Bustling \Bus"tling\ (b[u^]s"sl[i^]ng), a.
   Agitated; noisy; tumultuous; characterized by confused
   activity; as, a bustling crowd. "A bustling wharf."
   --Hawthorne.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Bustle \Bus"tle\ (b[u^]s"s'l), v. i. [imp. & p. p. Bustled
   (-s'ld); p. pr. & vb. n. Bustling (-sl[i^]ng).] [Cf. OE.
   buskle, perh. fr. AS. bysig busy, bysg-ian to busy + the
   verbal termination -le; or Icel. bustla to splash, bustle.]
   To move noisily; to be rudely active; to move in a way to
   cause agitation or disturbance; as, to bustle through a
   crowd.
   [1913 Webster]

         And leave the world for me to bustle in. --Shak.
   [1913 Webster]

WordNet (r) 3.0 (2006):

bustling
    adj 1: full of energetic and noisy activity; "a bustling city"

Moby Thesaurus II by Grady Ward, 1.0:

27 Moby Thesaurus words for "bustling":
   active, agitated, brisk, busy, energetic, eventful, fidgety,
   fluttering, fluttery, fretful, full of incident, fussing, fussy,
   hopping, humming, hustling, jumpy, lively, momentous, on the go,
   phenomenal, popping, restless, stirring, turbulent, unquiet,
   unsettled