D defs.my
Entry 2 senses Webster, 1913

Inertness

· In·ert·ness · IPA /ˌɪnˈɜrtnəs/
01 n. Lack of activity or exertion; habitual indisposition to action or motion; sluggishness; apathy; insensibility.
  1. 1.
    Lack of activity or exertion; habitual indisposition to action or motion; sluggishness; apathy; insensibility.
    “Laziness and inertness of mind.” Burke.
  2. 2.
    Absence of the power of self-motion; inertia.