Become exhausted is a term that describes the feeling of being completely drained of energy. The crossword solutions for this term are TIRE (4 letters), pooped out (7 letters), petered out (8 letters), and run out of gas (11 letters). TIRE implies becoming worn out from physical or mental exertion, pooped out suggests being completely drained of energy, petered out implies gradually losing strength or momentum, and run out of gas implies having no more energy or enthusiasm left.