Pronunciation: [mˈʌmpɪʃ] (IPA) 
Mumpish is a rarely used word with unclear origins. Its spelling can be explained using the International Phonetic Alphabet (IPA). The first syllable "mum" is pronounced as /mʌm/, rhyming with "bum". The second syllable "pish" is pronounced as /pɪʃ/, rhyming with "wish". Together, the word is pronounced as /ˈmʌmpɪʃ/. Although not commonly used, mumpish is an adjective that describes someone who is sulky or bad-tempered.
Mumpish is an adjective that describes someone's behavior or demeanor as grumpy, moody, sulky, or ill-tempered. It is primarily used to characterize a person who is being peevish, stubborn, or difficult to please. The term can also be applied to someone who is excessively fretful, whiny, or prone to complaining without reason.
This slang term originated in the late 16th century and has since remained relatively obscure. It is derived from the noun "mump," which originally referred to a complaint or expression of displeasure. Over time, the term evolved to describe someone who frequently grumbles or sulks, and "mumpish" subsequently entered the lexicon to describe the behavior associated with such individuals.
A person displaying mumpish behavior might often wear a sour expression, reply curtly or dismissively, and generally make their discontent or irritability apparent. They may find fault with various situations or be more easily annoyed or offended than others. Such individuals tend to radiate an air of dissatisfaction or disgruntlement, which can have an impact on their relationships or interactions with others.
Overall, mumpish is an adjective used to depict someone who is irritable, peevish, or prone to grumbling and sulking. It is a descriptor employed when referring to someone's disagreeable or ill-tempered demeanor, suggesting a tendency to complain, whine or be unnecessarily difficult.
Sullenly silent; sullen; sour.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.
The word "mumpish" is derived from the Middle English term "mumpe" which means to mumble or mutter in a discontented manner. This later gave rise to the noun "mumps" referring to a surly or moody person. "Mumpish" emerged as an adjective in the early 17th century, describing someone who is grumpy, sulky, or ill-tempered.
