Lazy is not wanting to make the effort, and then not making it. Think of the pan left to soak for three days, or the friend who takes the lift up one floor.
The word stretches past people. A lazy Sunday is slow and pleasant with nothing shameful in it, and the lazy river at a water park just drifts you round in a circle. In an eye clinic, a lazy eye is one that wanders and stops pulling its weight. The frame you meet most is too lazy to: too lazy to cook, too lazy to walk round the block. Mind the sting, though. Calling a person lazy is an accusation about their character, so English reaches for laid-back or relaxed when no blame is meant.
1adjectivelazyUnwilling to work or make an effort.
“He is too lazy to walk to the corner shop, so he has everything delivered.”
2adjectiveslowSlow, unhurried and pleasantly without purpose.
“They spent a lazy afternoon in the garden with a jug of lemonade.”
3adjectivedoneDone without care or thought.
“The article leans on lazy stereotypes about young people.”
Too few real examples of this word to estimate which sense is commonest.
Lazy turns up in English around 1540 and nobody is certain where it came from. The best guess sends it back to Middle Low German lasich, "slack, feeble, lazy", through Old Saxon lask to Proto-Germanic *lasiwaz, "feeble, weak", and a Proto-Indo-European root *las-, "weak". A rival guess builds it out of lay, the way tipsy is built out of tip.
Proto-Indo-European
*las- — weak
Proto-Germanic
*lasiwaz
Old Saxon
lask
Middle Low German
lasich — slack, feeble, lazy
English, today
lazy
Built from
Attested since 1540, origin uncertain. Probably from Low German - and Middle Low German lasich (“slack, feeble, lazy”), from las, from Old Saxon lask, from Proto-Germanic lasiwaz, laskaz (“feeble, weak”), from Proto-Indo-European las- (“weak”). Akin to Dutch leuzig (“lazy”), German lässig (“casual, nonchalant, laid-back, easy-going”), Old Norse lasinn (“limpy, tired, weak”), Old English lesu, lysu (“false, evil, base”). More at lush. An alternative 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.
Etymology from Wiktionary, CC BY-SA