dead tired

extremely tired, very sleepy

very tired, blotto, zonked After fighting the fire, they were dead tired - exhausted.

Synonyms and related words:
all in, beat, beat up, beaten, bone-weary, bushed, dead, dead-and-alive, deadbeat, dog-tired, dog-weary, done, done in, done up, drained, exhausted, fagged out, gone, knocked out, played out, pooped, pooped out, prostrate, ready to drop, spent, tired out, tired to death, tuckered out, used up, washed-up, weary unto death, whacked, wiped out, worn-out,