The Swedish word for narrow is
trång

Translations for narrow and their definitions

trång	©
1. adj. tight, narrow, cramped (not able to comfortably accommodate someone/something)
en trång öppning - a narrow opening
Det är för trångt. Vi kommer inte igenom. - It's too tight. We can't get through.
krypa genom en trång grottunnel - crawl through a tight cave tunnel
en trång lägenhet - a cramped apartment
Det var trångt om plats kring bordet - Space was tight around the table

smal
1. adj. not wide, narrow
att gå den smala vägen - to walk the narrow road
2. adj. slim, slender, thin (of a person or body part, fairly neutral in itself)