The word "conked" is often used informally to describe someone who is exhausted, tired, or passed out. A few synonyms for "conked" include "exhausted," "worn out," "fatigued," "drained," and "spent." Another set of synonyms might include "asleep," "unconscious," "knocked out," "dead to the world," and "out like a light." While these words may not be interchangeable in every situation, they all share the sense of being utterly drained or incapacitated in some way. Whether you're describing someone who fell asleep in the middle of a meeting or someone who collapsed from exhaustion after running a marathon, these synonyms can help you convey the sense of exhaustion and depletion that "conked" implies.