Fulsomeness is the quality of being fulsome: the too-muchness of the praise, the thanks, the flattery. It is not the speech itself so much as the greasy extra in it — the pile of compliments that makes an apology feel cheap, or a review feel bought. You notice the fulsomeness; you step back from it. It is a rather formal noun, the kind you meet in a careful essay, not at the night market. Though actually, like fulsome, it sits on a word that once meant simple abundance, so an older writer might have used fulsomeness for plenty. Today, for a learner, treat it as the insincere overflow: not warmth, but warmth piled so high it topples. If a thank-you is sincere and large, we praise its warmth or generosity, not its fulsomeness.

過分的恭維、溢美過頭（那種讓人覺得假的質地）