Where does “folnesse” come from?

folnesse (Middle English) comes from Old English fulnes, from Old English -nes, from Proto-West Germanic -nassī, from Proto-Germanic -inassuz, from Proto-West Germanic -ī, from Proto-Germanic -į̄, from Proto-Indo-European -íh₂, from Proto-Indo-European -h₂ — Creates collective nouns, which refer to groups...

Ancestry of “folnesse”, step by step

folnesse traces back through 3 separate lines of ancestry.

via Old English fulnes

StepLanguageWordMeaning
1Old Englishfulnesfoulness; impurity; stench
2Old English-nesUsed to form abstract nouns, usually from...
3Proto-West Germanic-nassīUsed to form abstract nouns, usually from...
4Proto-Germanic-inassuz-ness
5Proto-West Germanic-ī-ness, -th
6Proto-Germanic-į̄-th
7Proto-Indo-European-íh₂—
8Proto-Indo-European-h₂Creates collective nouns, which refer to groups...

via Old English fylnes

StepLanguageWordMeaning
1Old Englishfylnes—

via Old English fyllnis

StepLanguageWordMeaning
1Old Englishfyllniscompleteness; abundance
Every word from Proto-Indo-European -h₂ →Every word from Old English -nes →Every word from Proto-Germanic -į̄ →