The Greek noun agathōsunē (ἀγαθωσύνη) means goodness, moral uprightness, and generous virtue. It appears only four times in the New Testament (Romans 15:14; Galatians 5:22; Ephesians 5:9; 2 Thessalonians 1:11) and is notably a fruit of the Holy Spirit in Galatians 5:22. The word is rare in classical Greek and almost exclusively biblical — it was likely coined or specially adopted by the early church to describe a distinctly Christian quality. Unlike chrestotēs (G5544, kindness — a gentle, mild virtue), agathōsunē is a more robust, active goodness that includes moral courage and even righteous boldness.
The distinction between agathōsunē (goodness) and chrestotēs (kindness) is instructive: chrestotēs is gentle and accommodating; agathōsunē can be firm, direct, and even confrontational when necessary — but always for the other's good. Jesus turning over tables in the temple was an act of agathōsunē. Paul rebuking Peter to his face (Galatians 2:11) was an act of agathōsunē. True goodness does not always look nice; it looks like love that refuses to enable harm. As a fruit of the Spirit (Galatians 5:22), agathōsunē is not a product of human effort but of divine transformation — the Spirit producing in the believer the very goodness of God's own character. This fruit grows as believers are "filled with all goodness" (Romans 15:14) through the indwelling Word and Spirit.