adjective

showing or expressing gratitude, pleasure, or approval in an unrestrained or heartfelt manner.

an effusive welcome

gushing,gushy,unrestrained,unreserved,extravagant,fulsome,demonstrative,lavish,enthusiastic,rhapsodic,lyrical,exuberant,ebullient,expansive,wordy,verbose,long-winded,profuse,over the top,OTT,all over someone