grump (n.)youdaoicibaDictYouDict[grump 词源字典]
"ill-humor," 1727, in humps and grumps "surly remarks," later the grumps "a fit of ill-humor" (1844), then "a person in ill humor" (1900); perhaps an extended sense of grum "morose, surly," which probably is related to Danish grum "cruel;" or perhaps suggested by grumble, grunt, etc.[grump etymology, grump origin, 英语词源]
miff (n.)youdaoicibaDictYouDict
1620s, "fit of ill humor," perhaps imitative of an exclamation of disgust (compare German muffen "to sulk").
pettish (adj.)youdaoicibaDictYouDict
1550s, "impetuous," evidently from pet (n.2) in its "ill humor" sense + -ish. Meaning "peevish, easily annoyed" is from 1590s.
It has naturally been assoc. with PET sb.1, as being a characteristic habit of a "pet" or indulged and spoiled child; but the connexion of sense is not very clear or simple .... [OED]
Related: Pettishly; pettishness.