WordWeb Online

1. Extremely exhausted
   "he went to bed dog-tired";
   - knackered [Brit, informal], drained, zonked [informal], zonked out [informal], stonkered [Brit, Austral, NZ, informal], deadbeat [Brit, informal], shagged out [Brit, informal], shagged [Brit, informal], shattered [Brit, informal], exhausted, fagged [Brit, informal], fatigued, played out, spent, washed-out, worn-out, worn out, gone, shot [informal], fried [N. Amer, informal], pooped [N. Amer, informal]

See also: tired