Does the word "impermissible" (lā yajūz) in Islam mean "forbidden" (ḥarām)?

The ruling on something as "impermissible" often means it is haram (forbidden). However, jurists may use this term to refer to something makruh (disliked). It might be intended to negate permissibility where both sides are equally valid, thus applying to something makruh or khilaf al-awla (less preferable). The negation of halal (permissibility) can be understood in this sense. Negating permissibility where both sides are equally valid makes the action makruh rather than prohibited.