Dictionary.com
Thesaurus.com
Synonyms

goop

1 American  
[goop] / gup /

noun

Informal.

  1. a bad-mannered or inconsiderate person; clod; boor.

goop 2 American  
[goop] / gup /

noun

Slang.

  1. a viscous or sticky substance; goo.

goop British  
/ ɡuːp /

noun

  1. a rude or ill-mannered person

  2. any sticky or semiliquid substance

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Other Word Forms

  • goopy adjective

Etymology

Origin of goop1

Expressive coinage, apparently first used by Gelett Burgess in his book Goops and How to Be Them (1900)

Origin of goop2

1955–60; expressive coinage akin to glop, gook 1, etc.

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Two problems: At the time, renewable energy cost too much to make it affordable, and adding water usually turns quicklime into an unwieldy goop.

From The Wall Street Journal • Mar. 27, 2026

That beige-colored goop had small pieces of particles floating in it before it became stiff from sitting and waiting to be used again.

From Salon • Feb. 17, 2024

And in that goop is where our show lives.

From New York Times • Feb. 1, 2024

Grease a 12-cup muffin pan with cake goop or baking spray.

From Seattle Times • Jan. 23, 2024

A Bunsen burner’s hissing blue flame was making a round-bottomed bottle full of purple goop burble and bubble.

From "The Smartest Kid in the Universe" by Chris Grabenstein

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.