Where does “sleveles” come from?

sleveles (Middle English) comes from Old English slīeflēas, from Old English lēas, from Proto-Germanic *laus.

Ancestry of “sleveles”, step by step

StepLanguageWordMeaning
1Old Englishslīeflēassleeveless
2Old Englishlēasfalse, lax; false, void, loose; devoid of, loose...
3Proto-Germanic*laus—
Every word from Proto-Germanic *laus →Every word from Old English lēas →Every word from Old English slīeflēas →