Mope

google

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mid 16th century (the early noun sense being ‘fool or simpleton’): perhaps of Scandinavian origin; compare with Swedish dialect mopa ‘to sulk’.

wiktionary

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Of North Germanic origin, related to Swedish mopa(“to sulk”), Danish måbe. Compare also German muffen, French moue.

etymonline

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mope (v.)

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.