Where does “negativissimo” come from?

negativissimo (Italian) comes from Italian negativo, from Latin negativus, from Latin negō, from Latin nec, from Latin neque, from Proto-Indo-European nekʷe, from Proto-Indo-European ne — not.

Ancestry of “negativissimo”, step by step

Step	Language	Word	Meaning
1	Italian	negativo	negative; dismal
2	Latin	negativus	denied, negative, that which denies; inhibiting
3	Latin	negō	to deny
4	Latin	nec	nor; and not, not; neither
5	Latin	neque	not; and not, also not
6	Proto-Indo-European	nekʷe	and not, neither, nor
7	Proto-Indo-European	ne	not

Every word from Proto-Indo-European ne →Every word from Proto-Indo-European nekʷe →Every word from Latin neque →