This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Want of activity or exertion; habitual indisposition to action or motion; sluggishness; apathy; insensibility.

n. Absence of the power of self-motion; inertia.

n. Quality of being unreactive with other chemical compounds or elements.

n. Lack of activity or exertion; habitual indisposition to action or motion; sluggishness; apathy; insensibility.

n. Absence of the power of self-motion; inertia.

n. The state or quality of being inert

n. The state of being inherently destitute of the power of motion or action; that property by which bodies tend to persist in a state of rest, or of motion derived from external force. See inertia.

n. immobility by virtue of being inert

"Thus we shall speak of matter as showing the attribute of 'inertness', when it is subject to mechanical causation, of 'alertness', when it is subject to magical causation."

immobility   

sluggishness    apathy    insensibility    inertia    deadness   

alertness   

supineness    lassitude    listlessness    inertia    laziness    feebleness    sluggishness    inactivity    cowardliness    irresolution