An example of a curmudgeon is a person who is always angry and never socializes with others.
Origin of curmudgeon; from uncertain or unknown; perhaps
Origin of curmudgeonOrigin unknown.
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.