Nonetheless, in the store, I've been blithely buying smaller packages without noticing that my sugar had shrunk.
But they are ill prepared and blithely ignorant of the mechanics of practical politics—let alone state making.
blithely, he conducts his life with an absence of material possessions.
Old English bliþe "joyous, kind, cheerful, pleasant," from Proto-Germanic *blithiz "gentle, kind" (cf. Old Saxon bliði "bright, happy," Middle Dutch blide, Dutch blijde, Old Norse bliðr "mild, gentle," Old High German blidi "gay, friendly," Gothic bleiþs "kind, friendly, merciful").
Rare since 16c. No cognates outside Germanic. "The earlier application was to the outward expression of kindly feeling, sympathy, affection to others, as in Gothic and ON.; but in OE. the word had come more usually to be applied to the external manifestation of one's own pleased or happy frame of mind, and hence even to the state itself." [OED]