A2noun
مُنْكَرٌ
munkar
evil deed / what is rejected as wrong
Example
كَانُوا لَا يَتَنَاهَوْنَ عَنْ مُنْكَرٍ فَعَلُوهُ
kānū lā yatanāhawna ʿan munkarin faʿalūh
They did not forbid one another from wrongdoing they committed (5:79)
Grammar
Passive participle of أَنْكَرَ (to deny/reject). Literally 'what is rejected.' Used as noun meaning evil/wrong.
Culture
Paired with maʿrūf as the core ethical binary in the Quran. Failure to forbid munkar led to divine punishment of past nations.