Narrowest

adjective

1. Having a small width; not wide; having opposite edges or sides that are close, especially by comparison to length or depth.

   "a narrow hallway"

2. Of little extent; very limited; circumscribed.
3. Restrictive; without flexibility or latitude.

   "a narrow interpretation"

4. Contracted; of limited scope; bigoted

   "a narrow mind"

5. Having a small margin or degree.

   "The Republicans won by a narrow majority."