Where does “arduity” come from?

arduity (English) comes from Latin arduitas, from Latin arduus, from Proto-Italic arðwos, from Proto-Indo-European h₃erdʰ-, from Proto-Indo-European -wós — Creates adjectives from verb stems.

arduity (English): The state or quality of being arduous; steepness,...

Definitions

The state or quality of being arduous; steepness,...

Ancestry of “arduity”, step by step

Step	Language	Word	Meaning
1	Latin	arduitas	steepness; eminence, importance, prominence;...
2	Latin	arduus	lofty, high, steep, tall, elevated; hard to...
3	Proto-Italic	arðwos	—
4	Proto-Indo-European	h₃erdʰ-	to increase, grow; upright, high
5	Proto-Indo-European	-wós	Creates adjectives from verb stems

Every word from Proto-Indo-European -wós →