Lout
mid 16th century: perhaps from archaic lout ‘to bow down’, of Germanic origin.
wiktionary
Of dialectal origin, likely from Middle English louten(“to bow, bend low, stoop over”) from Old English lutian from Proto-Germanic *lutōną. Cognate with Old Norse lútr(“stooping”), Gothic 𐌻𐌿𐍄𐍉𐌽( lutōn, “to deceive”). Non-Germanic cognates are probably Old Church Slavonic лоудити(luditi, “to deceive”) [1], Serbo-Croatian lud and Albanian lut(“to beg, pray”).
From Middle English louten, from Old English lūtan, from Proto-Germanic *lūtaną. Cognate with Old Norse lúta, Danish lude(“to bend”), Norwegian lute(“stoop”), Swedish luta.
etymonline
lout (n.)
1540s, "awkward fellow, boor, bumpkin," of uncertain origin. Perhaps a noun from a dialectal survival of Middle English louten (v.) "bow down" (c. 1300), from Old English lutan "bow low," from Proto-Germanic *lut- "to bow, bend, stoop" (source also of Old Norse lutr "stooping," which itself might also be the source of the modern English word).
According to Watkins this is from PIE *leud- "to lurk" (source also of Gothic luton "to deceive," Old English lot "deceit), also "to be small" (see little). Non-Germanic cognates probably include Lithuanian liūdėti "to mourn;" Old Church Slavonic luditi "to deceive," ludu "foolish." Sense of "cad" is first attested 1857 in British schoolboy slang.
