Sweaty

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Old English swāt (noun), swǣtan (verb), of Germanic origin; related to Dutch zweet and German Schweiss, from an Indo-European root shared by Latin sudor .

wiktionary

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From Middle English swety, equivalent to sweat +‎ -y.

Intentional misspelling of sweetie, ironically adopted with reference to the other sense of sweaty(“covered in sweat”).

etymonline

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sweaty (adj.)

late 14c., "causing sweat;" 1580s, "soaked with sweat," from sweat (n.) + -y (2). Related: Sweatiness.