the.com/wholeheartedness

The reckless act of caring all the way through, with no escape hatch built in.

means The quality of giving yourself completely and sincerely to something, holding nothing back in commitment or feeling.

from A plain English compound, stacking three native pieces: 'whole' (Old English 'hāl,' sound and entire — the same root that gives us 'hale' and 'heal'), 'heart' (Old English 'heorte,' long the seat of courage and devotion), and the suffix '-ness' that turns a quality into a noun. The phrase 'with whole heart' is old indeed, but the tidy single word 'wholehearted' is a later assembly, with 'wholeheartedness' tacked on top — English doing what it loves, bolting small honest words into bigger ones.

Etymology
From Old English heorte, meaning courage as much as organ
Half-measures
Lukewarm effort signals fear of being seen failing
Research backed
Brene Brown's studies tie it to vulnerability tolerance
Physical proof
Genuine commitment shows in pupil dilation and micro-expressions
Old virtue
Aristotle prized doing things fully over doing them often
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