Lousy

wiktionary

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From Middle English lousy, lowsy, lousi, equivalent to louse +‎ -y.

etymonline

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lousy (adj.)

mid-14c., lousi, "infested with lice," from louse (n.) + -y (2). Figurative use as a generic adjective of abuse dates from late 14c.; sense of "swarming with" (money, etc.) is American English slang from 1843. Related: Lousiness.