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In some senses, knackered is marked as offensive, slang, UK, colloquial. Watch for register when choosing this word.
knackered
UK /ˈnæk.əd/ US /ˈnæk.ɚd/
adj 2
Definitions
adj
1
Tired or exhausted.
I've got this job in a warehouse just now and it finishes quite early but I'm dead knackered at the end of the day so I don't know about going out and like studying every night.
2003, Hugh Dauncey, Geoff Hare (editors), The Tour de France, 1903-2003: A Century of Sporting Structures, Meanings and Values, Frank Cass Publishers, London, 2005, page 225, Then, it all just gets worse and worse, you don't sleep so much, so you don't recover as well from the day's racing, so you go into your reserves, you get more knackered, so you sleep less... It's simply a vicious circle.
adj
1
Broken, inoperative.
In the end though he had to admit that the car was knackered...
We take an old knackered machine out to China and say, 'Copy that, brand new,' and they do.
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