To express restriction or limitation:
* Confinedly: This is a relatively uncommon word and may sound awkward in some contexts.
* Strictly: This implies a strong limitation or regulation.
* Closely: This suggests a tight or limited space.
* Severely: This suggests a harsh or extreme restriction.
* Tightly: This implies a firm or secure confinement.
To express the act of confining:
* Confiningly: This is a less common option, but it can be used to describe something that confines.
* Restrictively: This emphasizes the act of limiting or restricting.
To express the result of confinement:
* Confinement: This can be used as an adverb in some contexts, such as "He was confinement in his room."
The best choice will depend on the specific context and the nuance you wish to convey.