From Old English 'bliþs,' PIE *bhlei- (gentle) — a sibling of 'blithe' that evolved from gentleness to supreme and heavenly happiness.
Supreme happiness; utter joy and contentment; in theological usage, the joy of heaven or the beatific vision.
From Old English 'bliss' or 'bliþs' (bliss, joy, happiness), from Proto-Germanic *blīþisjō (joy), from *blīþiz (gentle, kind, joyful), from PIE *bhlei- (gentle, kind). The word is thus a cousin of 'blithe' (joyfully carefree) — both descend from a Proto-Germanic root meaning 'gentle' or 'kind,' which evolved in English toward the meaning of 'joy.' The Old English word frequently appeared in religious contexts, denoting the joy of paradise, and this theological register persists: 'bliss' carries a sense of transcendent, almost sacred happiness. Key roots: *bhlei- (Proto-Indo-European: "gentle
The words 'bliss' and 'blithe' are siblings from the same Proto-Germanic root meaning 'gentle' or 'kind.' The evolution from 'gentleness' to 'supreme happiness' suggests that early Germanic speakers associated the deepest joy not with ecstatic intensity but with quiet kindness — a remarkably tender etymology for English's strongest word for happiness.