"torpidity" in the noun sense
1. torpor, torpidity
a state of motor and mental inactivity with a partial suspension of sensibility
"he fell into a deep torpor"
2. listlessness, torpidity, torpidness, torpor
inactivity resulting from lethargy and lack of vigor or energy
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License