The feeling of becoming exhausted can be described in various ways using different synonyms. Some of the most commonly used synonyms include worn-out, drained, fatigued, depleted, enervated, spent, and weary. These words all describe the state of being physically or mentally tired and lacking energy. Moreover, the word "exhausted" can also be replaced with other words like knackered, shagged out, and pooped. All these synonyms are ideal for expressing how one feels after prolonged physical or mental exertion. In conclusion, using various synonyms for the word "exhausted" will help add color and variety to one's language, and make one's writing more interesting and expressive.