-üs]iv, -üz], ]ēv also ]əv adjective
1. archaic : pouring freely
washed with the effusive wave — Alexander Pope
2. : expressing or marked by unrestrained emotion : unduly demonstrative : gushing
at the sight of the stranger he sprang to his feet and darted forward, his hands outstretched, smiling with all his teeth, effusive — Aldous Huxley
insincere and effusive demonstrations of sentimental friendship — Dean Acheson
3. : characterized or formed by a nonexplosive outpouring of lava
effusive volcano
effusive eruption
effusive rock
• ef·fu·sive·ly ]ə̇vlē, -li adverb
• ef·fu·sive·ness ]ivnə̇s ]ēv- also ]əv- noun -es