Definify.com

Webster 1828 Edition

Noun.

Natural or habitual indolence or laziness; sloth; dullness; applied to persons.

2.Inertness; want of power to move; applied to inanimate matter.

Slowness; as the sluggishness of a steam.

sluggishness ‎(usually uncountable, plural sluggishnesses)

The property of being sluggish, unable or unwilling to act quickly.
The state of economic decline, inactivity, slow or subnormal growth.
- 2012, Javier Solana, Project Syndicate, Whose Sovereignty?:
  - And we see such interdependence even more clearly in their economic performance: China’s annual GDP growth rate, for example, will slow by two percentage points this year, owing to sluggishness in the United States and the EU.

the property of being sluggish