dundre is the neuter plural indefinite of dunder.

dunderN

Kven

1jyrinäN

2jylinäN

3pauhuN

Norwegian Bokmål – Kvendict-nob-fkv/src/N_nobfkv.xml:109971Edit on GitHub Suggest

Case	Sg	Pl
Indef	dunder	dundre
Def	dundret	dundrene