An example of a curmudgeon is a person who is always angry and never socializes with others.
Origin of curmudgeonfrom uncertain or unknown; perhaps
Origin of curmudgeonPossibly Scots cur- intensive prefix ( perhaps partly from Scottish Gaelic car rather, somewhat ) ( (from car a twist, a turn) ) ( and partly from Scottish Gaelic corr- intensive prefix ) ( (from corr protruding point ) ( from Old Irish corr snout) )Scottish Gaelic mùigean churl, gloomy fellow ( from diminutive of mùig gloom, gloomy appearance, snivelling nose, snot ) ( from Old Irish muich, múich gloom ) (Old Irish múchaid he smothers with smoke ) ( and Welsh mwg smoke )
Numerous folk etymologies exist for this word.
An alternative spelling attested in 1600 is cornmudgin, in Holland's translation of Livy, rendering frumentarius "corn-merchant". This has been suggested as the original form of the word, but English Dictionary OED notes that curmudgeon is attested some years before this, concluding that cornmudgin was merely a nonce-word by Holland.
The word is attested from the late 1500s in the forms curmudgeon and curmudgen, and during the 17th century in numerous spelling variants, including cormogeon, cormogion, cormoggian, cormudgeon, curmudgion, curmuggion, curmudgin, curr-mudgin, curre-megient.