Attested since 1540, origin uncertain. Probably from Middle Low German lasich, from las, from Proto-Germanic *lasiwaz, *laskaz, from Proto-Indo-European *las-. Akin to Dutch leuzig, Old Norse lasinn, Old English lesu, lysu. More at lush.
An alternate etymology traces lazy to Early Modern English laysy, a derivative of lay (plural lays + -y) in the same way that tipsy is derived from tip. See lay.
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