bushed

all in, aweary [archaic], beat, beaten, bleary, burned-out (or burnt-out), dead, done, drained, exhausted, fatigued, jaded, knackered [British], limp, logy (also loggy), played out, pooped [slang], prostrate, spent, tapped out, tired, tuckered (out), washed-out, wearied, weary, wiped out, worn, worn-out

addle, addled, addlepated, bedeviled, befogged, befuddled, bemused, bewildered, confounded, confused, dazed, distracted, dizzy, dopey (also dopy), fogged, mixed-up, muddleheaded, muzzy, pixilated (also pixillated), punch-drunk, punchy, raddled, shell-shocked, silly, slaphappy, spaced-out (or spaced), spacey (also spacy), stunned, stupefied, zonked, zonked-out