Where does “тѣснъ” come from?

тѣснъ (Old East Slavic) comes from Proto-Slavic těsnъ, from Proto-Slavic -nъ.

Ancestry of “тѣснъ”, step by step

StepLanguageWordMeaning
1Proto-Slavictěsnъnarrow
2Proto-Slavic-nъ

Words derived from “тѣснъ

Every word from Proto-Slavic -nъEvery word from Proto-Slavic těsnъ