ἁπλότηςhaplótēs

singleness, i.e. (subjectively) sincerity (without dissimulation or self-seeking), or (objectively) generosity (copious bestowal)

Greek (New Testament) · G572

Meanings

simplicity, sincerity: Romans 12:8, 2 Corinthians 11:3, Ephesians 6:5, Colossians 3:22; as manifested in generous, unselfish giving, liberality, graciousness: 2 Corinthians 8:2, 2 Corinthians 9:11, 2 Corinthians 9:13 (see ICC, Romans 12:8; Hort, James 1:5, and see ἁπλῶς).

Appears 8 times in the Bible.

Romans 12:8 If your gift is to encourage others, be encouraging. If it is giving, give generously. If God has given you leadership ability, take the responsibility seriously. And if you have a gift for showing kindness to others, do it gladly.
2 Corinthians 1:12 We can say with confidence and a clear conscience that we have lived with a God-given holiness and sincerity in all our dealings. We have depended on God’s grace, not on our own human wisdom. That is how we have conducted ourselves before the world, and especially toward you.
2 Corinthians 8:2 They are being tested by many troubles, and they are very poor. But they are also filled with abundant joy, which has overflowed in rich generosity.
2 Corinthians 9:11 Yes, you will be enriched in every way so that you can always be generous. And when we take your gifts to those who need them, they will thank God.
2 Corinthians 9:13 As a result of your ministry, they will give glory to God. For your generosity to them and to all believers will prove that you are obedient to the Good News of Christ.
2 Corinthians 11:3 But I fear that somehow your pure and undivided devotion to Christ will be corrupted, just as Eve was deceived by the cunning ways of the serpent.

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