1. A state of mental or physical inactivity or insensibility.
2. Lethargy; apathy. See Synonyms at lethargy.
3. The dormant, inactive state of a hibernating or estivating animal.
Torpor may extend for a longer period of time. Some animals enter this intensely deep state of hibernation for the duration of the winter. Torpor is alternatively used as a reference to any non-physiological state of inactivity.