μεταμέλλομαιmetaméllomai

Same root

• μετάmetá · G3326properly, denoting accompaniment; "amid" (local or causal); modified variously according to the case (genitive association, or accusative succession) with which it is joined; occupying an intermediate position between G575 (ἀπό) or G1537 (ἐκ) and G1519 (εἰς) or G4314 (πρός); less intimate than G1722 (ἐν) and less close than G4862 (σύν))
• μέλωmélō · G3199to be of interest to, i.e. to concern (only third person singular present indicative used impersonally, it matters)
• ἀμεταμέλητοςametamélētos · G278irrevocable

Where it appears

Appears 6 times in the Bible.

• Matthew 21:29 The son answered, ‘No, I won’t go,’ but later he changed his mind and went anyway.
• Matthew 21:32 For John the Baptist came and showed you the right way to live, but you didn’t believe him, while tax collectors and prostitutes did. And even when you saw this happening, you refused to believe him and repent of your sins.
• Matthew 27:3 When Judas, who had betrayed him, realized that Jesus had been condemned to die, he was filled with remorse. So he took the thirty pieces of silver back to the leading priests and the elders.
• 2 Corinthians 7:8 I am not sorry that I sent that severe letter to you, though I was sorry at first, for I know it was painful to you for a little while.
• Hebrews 7:21 but there was an oath regarding Jesus. For God said to him, “The Lord has taken an oath and will not break his vow: ‘You are a priest forever.’”