Where does “self-righteousness” come from?

self-righteousness (English) comes from English righteousness, from English rightwiseness, from Middle English rightwisnes, from Old English rihtwīsnes, from Old English -nes, from Proto-West Germanic -nassī, from Proto-Germanic -inassuz, from Proto-West Germanic -ī — Creates collective nouns, which refer to groups...

self-righteousness (English): Confidence in one's own righteousness,...

Definitions

  1. Confidence in one's own righteousness,...

Ancestry of “self-righteousness”, step by step

self-righteousness traces back through two separate lines of ancestry.

via English righteousness

StepLanguageWordMeaning
1EnglishrighteousnessThe quality or state of being righteous;...
2Englishrightwisenessrighteousness
3Middle Englishrightwisnesjustice
4Old Englishrihtwīsnesjustice, righteousness
5Old English-nesUsed to form abstract nouns, usually from...
6Proto-West Germanic-nassīUsed to form abstract nouns, usually from...
7Proto-Germanic-inassuz-ness
8Proto-West Germanic-ness, -th
9Proto-Germanic-į̄-th
10Proto-Indo-European-íh₂
11Proto-Indo-European-h₂Creates collective nouns, which refer to groups...

via English self-righteous

StepLanguageWordMeaning
1Englishself-righteousPiously self-assured and smugly moralistic
2Englishself-of, by, in or with oneself or itself; automatic
3Middle Englishself-
4Old Englishseolf-Alternative form of self-
5Old Englishself-self, oneself; own, one's own
6Old Englishselfself; oneself, personally
7Proto-West Germanic*selb
8Proto-Germanicselbazself
9Proto-Indo-Europeanselbʰ-one's own
10Proto-Indo-Europeans(w)e-separate, apart; separate; apart; oneself; one's...
11Proto-Indo-Europeanswéself
Every word from Proto-Indo-European -h₂