penitential

/ˌpɛnɪˈtɛnʃəl/
adjective
  1. Relating to or expressing regret for wrongdoing, especially as part of a religious practice of penance.
    • The penitential psalms are often recited during Lent.
    • The church held a penitential service for those seeking forgiveness.
    • He wore a penitential robe as a sign of his sorrow.
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