憾 means “regret, regrettable”

かん · kan

Also: remorse, be sorry

Kun'yomi (Japanese reading)
うらむ
On'yomi (Chinese reading)
カン

JLPT N1 · Taught in secondary school · 16 strokes

The story

The heart (忄) beside 感, feeling: a feeling that lingers. 憾 lives in 遺憾, regret, the stiff word of official statements, and in 遺憾なく, leaving nothing to regret, as when a player shows their skill to the full.

Used in 遺憾 (ikan, regret) and 遺憾なく (ikan naku, to the full)

More from Joy & Sorrow

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Readings from KANJIDIC2, © EDRDG, CC BY-SA.