A malicious lie is told with a view to harming someone; its purpose is to make the person suffer in some way or experience distress.
وَٱلْكَذِبُ ٱلْمَاكِرُ لَيْسَ تَضْخِيمَ ٱلْوَقَائِعِ وَلَا ٱلتَّفَوُّهَ بِعِبَارَاتٍ تُعْطِي ٱنْطِبَاعًا خَاطِئًا لكِنَّهَا ذَاتُ طَبِيعَةٍ غَيْرِ خَطِيرَةٍ .‏