1560s, "to move and act unconsciously;" 1580s, "to be listless and apathetic," the sound of the word perhaps somehow suggestive of low feelings (compare mop (v.) "make a wry mouth" (1560s); Low German mopen "to sulk," Dutch moppen "to grumble, to grouse," Danish maabe, dialectal Swedish mopa "to mope"). Related: Moped; moping; mopey; mopish.

"disappoint, offend, throw into a state of sulky dissatisfaction," 1680s, from dis-, here probably meaning "entirely, very," + obsolete gruntle "to grumble, utter a low grunt" (Middle English gruntelen, early 15c.), frequentative of grunt (v.); hence "to complain" (by 1560s). All citations in OED are in the form of the past-participle adjective.

c. 1200, grucchen, "to murmur, complain, find fault with, be angry," from Old French grouchier, grocier "to murmur, to grumble," of unknown origin, perhaps from Germanic, probably ultimately imitative. Meaning "to begrudge" is c. 1400. Compare gruccild (early 13c.) "woman who complains," from grutch + suffix of unknown origin. Related: Grutched; grutching. As a noun from c. 1400.

early 14c., crouken, of birds (crow, raven, crane), "make a low, hoarse sound," imitative or related to Old English cracian (see crack (v.)). Of frogs, c. 1400. Meaning "forebode evil, complain, grumble" is from mid-15c., perhaps from the raven as a bird of foreboding. Slang meaning "to die" is first recorded 1812, from sound of death rattle. Related: Croaked; croaking.

"acute inflammation of the mucous membranes of the nose, eyes, etc., a head-cold," 1630s, medical Latin, from Latinized form of Greek koryza "running at the nose," which is of uncertain etymology. It is traditionally compared to Germanic words for "mucus," such as Old English hrot, Old High German (h)roz "mucus" which are verbal nouns from Old English hrutan, Old High German hruzzan "to grumble, snore."

king of Ithaca at the time of the Trojan War, son of Laertes and Anticleia, from Greek Odysseus, a name of unknown origin. Epic poets connected it with odyssasthai "to be angry, be grieved, grumble," but this now is regarded as folk-etymology. Beekes writes that "the name is typically Pre-Greek ... on account of the many variants." Among them are several by-forms with -l-: Olysseus, Olytteus, Oulixeus, etc., hence Latin Ulysses,Ulixes.

mid-15c., mokken, "make fun of," also "to trick, delude, make a fool of; treat with scorn, treat derisively or contemptuously;" from Old French mocquer "deride, jeer," a word of unknown origin. Perhaps from Vulgar Latin *muccare "to blow the nose" (as a derisive gesture), from Latin mucus; or possibly from Middle Dutch mocken "to mumble" or Middle Low German mucken "grumble." Perhaps ultimately it is imitative of such speech. Related: Mocked; mocking. Replaced Old English bysmerian. The sense of "imitate, simulate, resemble closely" (1590s, as in mockingbird ; also see mock (adj.)) is from the notion of derisive imitation.

c. 1600, "fact of being hated," from Latin odium "ill-will, hatred, grudge, animosity; offense, offensive conduct," related to odi "I hate" (infinitive odisse), from PIE *eod-io- "hatred" (source also of Greek odyssasthai "to be angry, be grieved, grumble," Armenian ateam "I hate," Old Norse atall, Old English atol "evil, dire, horrid, loathsome"). Meaning "hatred, detestation" is from 1650s. Often in an extended form, such as odium theologicum "hatred which is proverbially characteristic of theological disputes" (1670s).