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A mean-spirited, spiteful person.
[After the Grinch, title character of the children's book How the Grinch Stole Christmas (1957) by Dr. Seuss (Theodor Seuss Geisel).]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
informal US a person whose lack of enthusiasm or bad temper has a depressing effect on others
[C20: from a character in the 1957 children's book How the Grinch stole Christmas by Dr Seuss (1904–91), US writer and illustrator, whose full name was Theodor Seuss Geisel]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a person or thing that spoils or dampens the pleasure of others.
[1965–70; from the Grinch, name of a character created by Dr. Seuss (Theodor Seuss Geisel)]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.