- The state or quality of being inactive; inertness; as,
the inactivity of matter. - Idleness; habitual indisposition to action or exertion;
want of energy; sluggishness.
Meaning of 'inactivity' (Princeton's WordNet)
1 . inactivity
[ n]
Meaning (1): - a disposition to remain inactive or inert
Example in sentence:
he had to overcome his inertia and get back to work