lazy (adj.) Look up lazy at Dictionary.com
1540s, laysy, of persons, "averse to labor, action, or effort," a word of unknown origin. In 19c. thought to be from lay (v.) as tipsy from tip. Skeat is responsible for the prevailing modern view that it probably comes from Low German, from a source such as Middle Low German laisch "weak, feeble, tired," modern Low German läösig, early modern Dutch leuzig, all of which may go back to the PIE root *(s)leg- "slack." According to Weekley, the -z- sound disqualifies a connection with French lassé "tired" or German lassig "lazy, weary, tired." A supposed dialectal meaning "naught, bad," if it is the original sense, may tie the word to Old Norse lasenn "dilapidated," lasmøyrr "decrepit, fragile," root of Icelandic las-furða "ailing," las-leiki "ailment."

Replaced native slack, slothful, and idle as the usual word expressing the notion of averse to work. Lazy Susan is from 1917. Lazy-tongs is from 1836. Grose ("Dictionary of the Vulgar Tongue," 1788) has Lazy Man's Load: "Lazy people frequently take up more than they can safely carry, to save the trouble of coming a second time."