What is Hoarding?

I like this definition:

Hoarding is:
* the acquisition of, and failure to discard, a large number of possessions that appear to be useless or of limited value.
* living spaces sufficiently cluttered so as to preclude activities for which those spaces were designed
* significant distress or impairment in functioning caused by the hoarding
* Reluctance or inability to return borrowed items. As boundaries blur, impulsive acquisitiveness could sometimes lead to kleptomania or stealing.

The hoarder may mistakingly believe that the hoarded items are very valuable, or the hoarder may know that they are useless. A hoarder of the first kind may show off a cutlery set claiming it to be made of silver and mother-of-pearl, disregarding the fact that the packaging clearly states the cutlery is made of steel and plastic. A hoarder of the second type may have a fridge filled with food items that expired months ago without ever eating them, but would vehemently resist any attempts from relatives to dispose of the unusable food items. Ee-ewww!