1549,
laysy, of unknown origin. Replaced native
slack, slothful, and
idle as the main word expressing the notion of "averse to work." 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 Ger., cf. M.L.G.
laisch "weak, feeble, tired," modern Low Ger.
läösig, early modern Du.
leuzig, all of which may go back to the PIE root
*(s)leg- "slack." According to Weekley, the
-z- sound disqualifies a connection with Fr.
lassé "tired" or Ger.
lassig "lazy, weary, tired." A supposed dialectal meaning "naught, bad," if it is the original sense, may tie the word to O.N.
lasenn "dilapidated,"
lasmøyrr "decrepit, fragile," root of Icelandic
las-furða "ailing,"
las-leiki "ailment."
Laze is a back-formation first attested 1592;
lazybones is first attested 1592.
Lazy Susan is from 1917.
[ley-zee] 
adjective, -zi⋅er, -zi⋅est, verb, -zied, -zy⋅ing.
