ἀγαθωσύνηagathōsýnē

goodness, i.e. virtue or beneficence

Greek (New Testament) · G19

Meanings

goodness (representing "the kindlier, as δικαιοσύνη, the sterner element in the ideal character, " AR, Ephesians 5:9; on its relation to χρηστότης, see Tr., Syn., §lxiii): Romans 15:14, Galatians 5:22, 2 Thessalonians 1:11.

Same root

ἀγαθόςagathós · G18"good" (in any sense, often as noun)

Where it appears

Appears 4 times in the Bible.

Romans 15:14 I am fully convinced, my dear brothers and sisters, that you are full of goodness. You know these things so well you can teach each other all about them.
Galatians 5:22 But the Holy Spirit produces this kind of fruit in our lives: love, joy, peace, patience, kindness, goodness, faithfulness,
Ephesians 5:9 For this light within you produces only what is good and right and true.
2 Thessalonians 1:11 So we keep on praying for you, asking our God to enable you to live a life worthy of his call. May he give you the power to accomplish all the good things your faith prompts you to do.

Source: G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922), public domain.