torpor

This term describes a heavy, oppressive lack of energy that feels more like a biological or psychological shutdown than simple tiredness. It carries a connotation of numbness or a frozen state, often suggesting a lack of responsiveness to external stimuli. In biological contexts, it refers to a specific physiological adaptation where metabolic rates drop significantly. Unlike hibernation, which is a long-term seasonal state, torpor can be a short-term survival strategy used by animals to endure immediate environmental stress.