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knackered

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

1885–90; knacker to tire (attenuation of earlier sense “to kill”; cf. knacker def. 1) + -ed2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for knackered

knackered

adjective British slang
  1. exhausted; tired out
  2. worn out; no longer working, esp after long or hard use
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for knackered

adj.

"worn out, tired," past participle adjective from knacker (v.).

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Online Etymology Dictionary, © 2010 Douglas Harper