Where does “loneliness” come from?

Loneliness derives from English lonely, which combines English lone from Old English ān meaning "one" with English -ness, tracing back through Proto-Indo-European ḱóm and līg-.

loneliness (English): A feeling of depression resulting from being...

Definitions

  1. A feeling of depression resulting from being...

Ancestry of “loneliness”, step by step

loneliness traces back through two separate lines of ancestry.

via English lonely

StepLanguageWordMeaning
1EnglishlonelyUnhappy because of feeling isolated from contact...
2EnglishLoneSolitary; having no companion
3EnglishaloneBy oneself, solitary; Apart from, or exclusive...
4Middle Englishallonealone
5Middle Englishonon, in; on; Alternative form of oon
6Old Englishonon, in, at, among; from
7Proto-West Germanicanaon
8Proto-Germanic*an
9Proto-Germanicanaon, at; on, onto; ana
10Proto-Indo-Europeanh₂en-on, onto

via English Ness

StepLanguageWordMeaning
1EnglishNessAn Ulster princess and the mother of Conchobar mac Nessa and Findchoem in the Ulster Cycle of Irish mythology. Daughter of Eochaid Sálbuide. Also the mother of Cormac Cond Longas by incest with Conchobar mac Nessa
2Middle Englishnesse
3Old Englishnæsnot, not at all; not; first/third-person singular...
4Proto-Germanicnasjąfoothill; headland; cape
5Proto-Indo-Europeannéh₂snose
Every word from Proto-Indo-European h₂en-Every word from Proto-Germanic anaEvery word from Proto-Germanic *an