different between wellness vs fellness

English

From Middle English welnes, welenes, equivalent to well +? -ness.

wellness (countable and uncountable, plural wellnesses)

The quality or state of being in good health.
The process of learning about and engaging in behaviors that are likely to result in optimal health.

Borrowed from English wellness.

wellness m or f (uncountable)

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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