1. lifelessness(n = noun.state) motionlessness, stillness - a state of no motion or movement; "the utter motionlessness of a marble statue"
is a kind of state
has particulars: fixedness, immobility, stationariness
Derived forms adjective lifeless3, adjective lifeless2
2. lifelessness(n = noun.attribute) inanimateness - not having life;
is a kind of physiological property
has particulars: deadness, insentience
Derived forms adjective lifeless1, adjective lifeless4, adjective lifeless3
not having life. [WordNet 1.5]