The difference between Inertia and Sloth

Inertia as a noun (physics, uncountable, or, countable):

The property of a body that resists any change to its uniform motion; equivalent to its mass.

Inertia as a noun (figuratively):

In a person, unwillingness to take action.

Inertia as a noun (medicine):

Lack of activity; sluggishness; said especially of the uterus, when, in labour, its contractions have nearly or wholly ceased.

Sloth as a noun (uncountable):

Laziness; slowness in the mindset; disinclination to action or labour.

Sloth as a noun (countable):

A herbivorous, arboreal South American mammal of the families Megalonychidae and Bradypodidae, noted for its slowness and inactivity.

Sloth as a noun (rare):

A collective term for a group of bears.

Sloth as a verb (obsolete, intransitive, transitive):

To be idle; to idle (away time).