Where does “grundig” come from?

grundig (Norwegian Bokmål) comes from Norwegian Bokmål grunn, from Old Norse grunnr, from Proto-Germanic grunduz, from Proto-Indo-European gʰrem-, from Proto-Indo-European gʰer- — to rub; to stroke; to grind.

grundig (Norwegian Bokmål): careful, exhaustive, meticulous, painstaking,...

Definitions

careful, exhaustive, meticulous, painstaking,...

Ancestry of “grundig”, step by step

Step	Language	Word	Meaning
1	Norwegian Bokmål	grunn	shallow; ground; reason
2	Old Norse	grunnr	bottom
3	Proto-Germanic	grunduz	ground, foundation
4	Proto-Indo-European	gʰrem-	to be angry; to sound, bellow, growl, roar, be...
5	Proto-Indo-European	gʰer-	to rub; to stroke; to grind

Every word from Proto-Indo-European gʰer- →Every word from Proto-Indo-European gʰrem- →Every word from Proto-Germanic grunduz →