An alternative or archaic form meaning the same as frankheartedness; the quality of being sincere and honest.
A variant of 'frankheartedness' where 'ed' was omitted before adding '-ness.' This represents an older English formation pattern where '-ness' was sometimes applied directly to compound adjectives without the '-ed' participle marker.
This word is a fossil of older English grammar rules—modern English standardized on 'frankheartedness,' but you'll occasionally spot 'frankheartness' in very old texts, showing how word formation rules shifted over centuries.
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