Where does “utvilsom” come from?

utvilsom (Norwegian Bokmål) comes from Norwegian Bokmål tvilsom, from Norwegian Bokmål søm, from Old Norse saumr, from Old Norse sýja, from Proto-Germanic siwjaną, from Proto-Indo-European sīw- — to sew.

utvilsom (Norwegian Bokmål): undoubted

Definitions

undoubted

Ancestry of “utvilsom”, step by step

utvilsom traces back through two separate lines of ancestry.

via Norwegian Bokmål tvilsom

Step	Language	Word	Meaning
1	Norwegian Bokmål	tvilsom	doubtful, dubious, questionable
2	Norwegian Bokmål	søm	a seam
3	Old Norse	saumr	seam, nails
4	Old Norse	sýja	to sew
5	Proto-Germanic	siwjaną	to sew
6	Proto-Indo-European	sīw-	to sew

via Norwegian Bokmål U

Step	Language	Word	Meaning
1	Norwegian Bokmål	U	The uppercase form of u, the twenty-first letter of the Norwegian Bokmål alphabet, written in the Latin script; preceded by t and followed by v
2	Latin	v	Capital form of
3	Etruscan	𐌖	—
4	Ancient Greek	Υ	ypsilon
5	Phoenician	𐤅	waw; {{l\|en\|waw}}
6	Egyptian	𓏲	—

Every word from Proto-Indo-European sīw- →Every word from Proto-Germanic siwjaną →Every word from Old Norse sýja →