someone who avoids new activities, ideas, or attitudes; old fogy.
Origin of stick-in-the-mud
First recorded in 1725–35
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Related Words for stick in the mudrightist, traditionalist, reactionary, diehard, classicist, moderate, zealot, fanatic, fundamentalist, pessimist, complainer, grouch, whiner, dampener, antediluvian, fuddy-duddy, conservative, stick-in-the-mud, fossil, mossback
informal a staid or predictably conservative person who lacks initiative or imagination
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
1733, from stick (v.) on notion of "to stick in the mud, to be content to remain in an abject condition."
Online Etymology Dictionary, © 2010 Douglas Harper