different between unfeelingness vs sluggishness

English

unfeeling +? -ness

unfeelingness (uncountable)

sluggish +? -ness

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.

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