Definition of "effusive"

All week I’ve found myself doing everything I can to distance myself in the crew’s eyes from the bovine herd I’m part of, to somehow unimplicate myself: I eschew cameras and sunglasses and pastel Caribbeanwear; I make a big deal of carrying my own cafeteria tray and am effusive in my thanks for the slightest service.

1997, David Foster Wallace, “A Supposedly Fun Thing I'll Never Do Again”, in A Supposedly Fun Thing I'll Never Do Again, Kindle edition, Little, Brown Book Group

While he is reasonably effusive about inter-city travel, he is heavily disparaging of all types of stopping service, including those on otherwise busy main lines. His analysis is not entirely unsound, and he tackles some of the questions head on.

2023 March 8, Gareth Dennis, “The Reshaping of things to come...”, in RAIL, number 978, page 47

wash'd with the effusive wave

1726, Homer, “Book XXII”, in [Alexander Pope], transl., The Odyssey of Homer. […], volume V, London: […] Bernard Lintot