• Munkar: the definition here concerns frequent error, frequent inattention or fisq in a narrator. The report is weak and not a basis for practice, though less severely weak than matrūk in this comparison.
• Mu‘allal: an apparently sound chain with a hidden defect in the chain or text affecting soundness.
Distinguish the stated narrator defect from a hidden defect. A problem in a particular chain does not automatically decide every other chain.