I'm exhaustedphraseVery tired.“I'm exhausted after that flight.”I'm wiped outphraseCompletely tired; casual.“That hike was fun, but I'm wiped out.”I'm beatphraseVery tired; casual.“I'm beat. Let's call it a night.”I'm running on emptyphraseI have almost no energy left.“After three nights of bad sleep, I'm running on empty.”I'm dead on my feetphraseI'm so tired I can barely stay standing.“After a twelve-hour shift, I'm dead on my feet.”