He shared his knowledge without any reluctance.
He is a person who spends money freely.
freely; generously; without holding back
Standard kanji spelling.
Alternate kanji spelling using 気.
Irregular okurigana usage; rarely seen.
Derived from the adjective 惜しい (oshii, 'regrettable, precious') with the suffix げ (ge, '-looking, seeming'), indicating an appearance or feeling of reluctance.