## Etymology
From hearty plus the noun-forming suffix -ness; hearty derives from heart, from Old English heorte ('heart'), from Proto-Germanic *hertô.

## AI Etymology
heartiness comes from hearty plus the noun-forming suffix -ness; hearty derives from heart, from Old English heorte ('heart'), from Proto-Germanic *hertô. Morphologically, the ending is part of the etymology: the suffix is attached to the older base named in the history, producing a later English derivative. In present English, the noun sense is "warm, vigorous friendliness or enthusiasm", so the historical development ends in a clearly identifiable modern dictionary use. The same base also appears in related forms such as heart, hearty, and heartily. Its semantic neighborhood includes warmth, cordiality, enthusiasm, and vigor, which helps locate the modern sense without adding a separate etymological claim. The named historical forms include Old English heorte.

## Topics
- Weather & Climate
- Word Formation & Derivatives

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