different between cruelty vs fellness

English

From Middle English cruelte, from Old French crualté (French cruauté), from Latin crudelitas. Surface analysis: cruel +? -ty.

cruelty (countable and uncountable, plural cruelties)

(uncountable) An indifference to suffering or pleasure in inflicting suffering.
Synonyms: mercilessness, barbarism, ruthlessness
Antonym: mercy
(countable) A cruel act.

From fell +? -ness.

fellness (uncountable)

The state or quality of being fell; awfulness, horror, cruelty.
- 1590, Edmund Spenser, The Faerie Queene, II.viii:
  For very felnesse lowd he gan to weepe, / And said, Caytiue, cursse on thy cruell hond [...].

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