REALLY EXHAUSTED is a term used to describe a state of extreme fatigue, often caused by physical or mental exertion. The crossword solutions ENERVATED (9 letters), DEAD (4 letters), READYTODROP (11 letters), TUCKEREDOUT (11 letters), ONONESLASTLEGS (14 letters) and WORNTOAFRAZZLE (14 letters) all describe this state in different ways. ENERVATED implies a lack of energy, DEAD suggests a complete lack of energy, READYTODROP implies a feeling of being close to collapse, TUCKEREDOUT suggests a feeling of being completely drained, ONONESLASTLEGS implies a feeling of being on the brink of exhaustion, and WORNTOAFRAZZLE implies a feeling of being completely worn out. All of these terms can be used to describe the same state of being REALLY EXHAUSTED.