different between heartiness vs avidity

English

hearty +? -ness

heartiness (usually uncountable, plural heartinesses)

From Middle English avidite, from Old French avidite (modern French avidité), from Latin avidit?s (“avidity, covetousness”).

avidity (usually uncountable, plural avidities)

Greediness; strong appetite.
Eagerness; intenseness of desire.
- Little disappointed, then, she turned attention to "Chat of the Social World," gossip which exercised potent fascination upon the girl's intelligence. She devoured with more avidity than she had her food those pretentiously phrased chronicles of the snobocracy […] distilling therefrom an acid envy that robbed her napoleon of all its savour.
(biochemistry) The measure of the synergism of the strength of individual interactions between proteins.

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