/ ˈfʊlsəm; NAmE / adjective
( disapproving ) too generous in praising or thanking sb, or in saying sorry, so that you do not sound sincere :
a fulsome apology
He was fulsome in his praise of the Prime Minister.
► ful·some·ly adverb
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WORD ORIGIN
Middle English (in the sense abundant ): from full + -some .