1735, past-participle adjective from bemuse (v.). Related: Bemusedly.
Entries linking to bemused
bemuse v.
"to make utterly confused, put into muse or reverie, muddle, stupefy," from be- + muse (compare amuse); attested from 1735 but probably older, as Pope (1705) punned on it as "devoted utterly to the Muses."