وأما المشكل: فهو ما ازداد خفاءً على الخفي
Mushkil is more obscure than khafī.
الطلب ثم التأمل
The interpreter must first seek the relevant evidence and then reflect carefully to identify the intended sense.
For example, the expression “I will not eat with a relish” may be difficult in its customary extension: does meat, cheese, or an egg count? The issue is not only one unusual member of an otherwise fixed category; possible readings of the usage itself compete.
Mushkil is resolved through evidence-based linguistic comparison and interpretation, rather than unexamined assumptions.