The noun form of metamelomai (G3212). Denotes regret or remorse — an emotional response to wrongdoing that may or may not lead to genuine repentance. Contrasted with metanoia (true repentance).
The distinction between metameleia (remorse) and metanoia (repentance) is pastorally crucial. Remorse says 'I feel terrible about what I did.' Repentance says 'I will turn and go a different direction.' Judas had remorse (Matthew 27:3) but hanged himself. Peter had both remorse and repentance (Luke 22:62) and was restored. Feeling bad about sin is not the same as turning from it. Only repentance leads to life.