1
: resembling syrup in appearance or quality
coffee … thick and syrupy—Hugh MacLennan
2
: cloyingly sweet or sentimental
promptly cover the taste of defeat with syrupy new daydreams—Katharine Scherman when a syrupy mood is on him and his wife, they spend a deplorable amount of time clutching at and kissing each other—John McCarten
especially
: excessively sweet and melodious : dulcet
theater organ music, syrupy sweet —Rumer Godden slender fingers would draw out the syrupy music from the strings —Osbert Sitwell
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Merriam-Webster unabridged