effusive

Concise Oxford English Dictionary © 2008 Oxford University Press:
effusive /ɪˈfjuːsɪv/

▶adjective

• 1 expressing gratitude, pleasure, or approval in an unrestrained manner.

• 2 Geology relating to or denoting igneous rocks poured out as lava and later solidified.

– derivatives
effusively adverb,
effusiveness noun.