1. not in accordance with Christian principles or beliefs
2. lacking kindness, compassion, or charity; cruel or unforgiving

Examples

• His unchristian behavior toward the poor shocked the congregation.
• She considered it unchristian to turn away someone in need.
• The harsh punishment seemed unchristian and excessive.
• Many viewed the company’s treatment of workers as unchristian.
• His unchristian attitude made him unwelcome at the church gathering.
• The judge’s unchristian lack of mercy surprised everyone in the courtroom.