Where does “flau” come from?

flau (Norwegian Nynorsk) comes from Low German flau, from Dutch flauw, from Middle Dutch vlau, from Old French flou, from Frankish hlāo, from Proto-Germanic hlēwaz, from Proto-Indo-European ḱlew-, from Proto-Indo-European ḱel- — to cover; to incline.

flau (Norwegian Nynorsk): flat, insipid, tasteless; embarrassed,...

Definitions

flat, insipid, tasteless; embarrassed,...

Ancestry of “flau”, step by step

Step	Language	Word	Meaning
1	Low German	flau	—
2	Dutch	flauw	boring, tasteless; languid, weak; vague, hazy
3	Middle Dutch	vlau	—
4	Old French	flou	tired, weary
5	Frankish	hlāo	lukewarm, tepid, mild
6	Proto-Germanic	hlēwaz	lukewarm
7	Proto-Indo-European	ḱlew-	to hear
8	Proto-Indo-European	ḱel-	to cover; to incline

Every word from Proto-Indo-European ḱel- →Every word from Proto-Indo-European ḱlew- →Every word from Proto-Germanic hlēwaz →