[syn: effusive, gushing(a), gushy]
The Collaborative International Dictionary of English v.0.48:
effusive \ef*fu"sive\, a.
   1. Pouring out; pouring forth freely. [archaic] "Washed with
      the effusive wave." --Pope.
      [1913 Webster]
   2. (Geol.) formed by an outpouring of molten lava, or
      pertaining to rocks so formed.
      [PJC]
   3. overly demonstrative; expressing emotion in an
      unrestrained manner; exhibiting unrestrained enthusiasm;
      -- of people and human actions; as, effusive thanks; an
      effusive letter of recommendation. Contrasted with
      reserved. [WordNet sense 1+2]
   Syn: gushing, gushy, burbling, burbly. [PJC]
   Effusive rocks (Geol.), volcanic rocks formed by a
      nonexplosive outpouring of lava in molten or plastic form;
      in distinction from so-called intrusive, or plutonic,
      rocks. -- Ef*fu"sive*ly, adv. -- Ef*fu"sive*ness, n.
      [1913 Webster]
WordNet (r) 3.0 (2006):
effusive
    adj 1: uttered with unrestrained enthusiasm; "a novel told in
           burbly panting tones" [syn: burbling, burbly,
           effusive, gushing]
    2: extravagantly demonstrative; "insincere and effusive
       demonstrations of sentimental friendship"; "a large gushing
       female"; "write unrestrained and gushy poetry" [syn:
       effusive, gushing(a), gushy]
Moby Thesaurus II by Grady Ward, 1.0:
97 Moby Thesaurus words for "effusive":
   abundant, accessible, all jaw, approachable, candid, chatty,
   cloying, communicative, conversable, conversational, copious,
   demonstrative, diffuse, diffusive, ebullient, effluent, effused,
   emotional, expansive, extravagant, extravasated, extroverted,
   exuberant, fecund, flip, fluent, formless, frank, free,
   free-speaking, free-spoken, free-tongued, fulsome, gabby,
   garrulous, gassy, glib, gossipy, gregarious, gushing, gushy,
   lavish, long-winded, loquacious, multiloquent, multiloquious,
   newsy, open, outbound, outflowing, outgoing, outpouring, outspoken,
   outward-bound, overenthusiastic, overflowing, overtalkative,
   pleonastic, prodigal, productive, profuse, profusive, prolific,
   prolix, redundant, reiterative, repetitive, rhapsodic,
   self-revealing, self-revelatory, slobbering, slobbery, sloppy,
   slushy, smarmy, smooth, sociable, superabundant, talkative, talky,
   tautologous, teeming, unchecked, unconstrained, unhampered,
   unrepressed, unreserved, unrestrained, unrestricted, unreticent,
   unsecretive, unshrinking, unsilent, unsuppressed, verbose, voluble,
   windy