adjective, chum·mi·er, chum·mi·est. Informal.

friendly; intimate; sociable.

Origin of chummy

First recorded in 1825–35; chum1 + -y1
Related formschum·mi·ly, adverbchum·mi·ness, noun

Synonyms for chummy Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for chumminess

Historical Examples of chumminess

  • That is due to the chumminess or the affinity of iron with oxygen.

    The Boy With the U.S. Miners

    Francis Rolt-Wheeler

  • Her friendship with Lily Pendleton was not like the chumminess of other girls.

  • He was a jolly man, given to oratory and to chumminess with the arts.


    Sinclair Lewis

  • A state of chumminess between persons of opposite sex and suitable ages is more or less in the line of Nature.

  • Ive always wondered at your chumminess with him, said Nelson slowly, reseating himself.

British Dictionary definitions for chumminess


adjective -mier or -miest

informal friendly
Derived Formschummily, adverbchumminess, noun
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

Word Origin and History for chumminess



1874, from chum (n.1) + -y (2). Related: Chumminess. Previously it was a noun, a common name for a chimney sweep, as a corruption of chinmey.

Online Etymology Dictionary, © 2010 Douglas Harper