Where does “nonsupport” come from?

nonsupport (English) comes from English non, from French non, from Old French non, from Latin nōn, from Old Latin noenum, from Proto-Indo-European óynos — one; single.

nonsupport (English): A lack of support; The failure to provide for...

Definitions

A lack of support; The failure to provide for...

Ancestry of “nonsupport”, step by step

nonsupport traces back through two separate lines of ancestry.

via English non

Step	Language	Word	Meaning
1	English	non	Obsolete form of none
2	French	non	no; not; a no, a negative response
3	Old French	non	no; not; Alternative form of nom
4	Latin	nōn	not
5	Old Latin	noenum	—
6	Proto-Indo-European	óynos	one; single

via English support

Step	Language	Word	Meaning
1	English	support	To keep from falling; To answer questions and...
2	Middle English	support	—
3	Middle French	support	—

Every word from Proto-Indo-European óynos →Every word from Old Latin noenum →Every word from Latin nōn →