knackered

[nak-erd]
adjective British Slang.
exhausted; very tired: He is really knackered after work.

Origin:
1885–90; knacker to tire (attenuation of earlier sense “to kill”; cf. knacker def. 1) + -ed2

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World English Dictionary
knackered (ˈnækəd)
 
adj
1.  exhausted; tired out
2.  worn out; no longer working, esp after long or hard use

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Getting home after work totally knackered and not falling asleep halfway through.
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