Synonyms for Effusive:

adj.

demonstrative (adjective)
profuse.
gushing, profuse (adjective)
fulsome, windy, demonstrative, gushy, unreserved, talkative, wordy, expansive, verbose.
informative (adjective)
communicative.
talkative (adjective)
expansive, garrulous.
verbose (adjective)
grandiloquent, loquacious, profuse, verbose, chatty, wordy, voluble, garrulous, bombastic, windy, talkative.

n.

wax lyrical (about/on something), be in/go into ecstasies, the gift of gab, enthuse, wax eloquent/lyrical/emotional, evangelize, rhapsodize, rave. effusive (noun)
burbly, demonstrative, burbling, gushing, lively, emotional, gushy.
unrestrained (noun)
expansive, fulsome, communicative, unreserved, overdemonstrative, rhapsodic, slobbering.

Other synonyms:

enthuse, evangelize. rave. disgusting
fulsome.
unreserved
expansive.
Other relevant words:
gushing, slobbering, communicative, burbling, lively, enthuse, gushy, rhapsodize, demonstrative, rhapsodic, fulsome, evangelize, rave, unreserved, burbly, overdemonstrative, expansive, emotional.

Usage examples for effusive

  1. The latter pointed out places of interest in passing, and finally, with an effusive good- bye, got out at the station before St. Servan. – Barbara in Brittany by E. A. Gillie