Bliss is perfect, complete happiness. Pure bliss, wedded bliss, sheer bliss.
It is uncountable and unusually strong, which is why it is so often used lightly about small pleasures: a hot bath is bliss. Wedded bliss is nearly always slightly ironic. Ignorance is bliss is the proverb, which is quoted far more often than the poem it comes from. Note blissful, and blissfully unaware, which is a fixed phrase meaning happily oblivious to something that is about to matter.
1nounblissPerfect, complete happiness.
“Lying in a hammock on a warm beach with a good book was pure bliss.”
bliss is a state of happiness.
Old English bliss comes from the same root as blithe, meaning cheerful. It is unrelated to bless, though the two have influenced each other's spelling and meaning for a thousand years.
Proto-West Germanic
*blīþisi — joy, goodness, kindness
Old English
bliss
Middle English
bliss
English, today
bliss
Built from
From Middle English bliss, from Old English bliss, variant of earlier blīds, blīþs (“joy, gladness”), from Proto-West Germanic blīþisi (“joy, goodness, kindness”).
Etymology from Wiktionary, CC BY-SA