unduly demonstrative; lacking reserve: effusive greetings; an effusive person.
pouring out; overflowing.
Geology. extrusive(def 3).

Origin of effusive

First recorded in 1655–65; effuse + -ive
Related formsef·fu·sive·ly, adverbef·fu·sive·ness, nounnon·ef·fu·sive, adjectivenon·ef·fu·sive·ly, adverbnon·ef·fu·sive·ness, nouno·ver·ef·fu·sive, adjectiveo·ver·ef·fu·sive·ly, adverbo·ver·ef·fu·sive·ness, nounun·ef·fu·sive, adjectiveun·ef·fu·sive·ly, adverbun·ef·fu·sive·ness, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for effusive



extravagantly demonstrative of emotion; gushing
(of rock) formed by the solidification of magma
Derived Formseffusively, adverbeffusiveness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for effusive

1660s, from Latin effus-, stem of effundere (see effusion) + -ive. Related: Effusively.

Online Etymology Dictionary, © 2010 Douglas Harper