ἀδαϊστί

From LSJ

λίγεια μινύρεται θαμίζουσα μάλιστ' ἀηδών → the sweet-voiced nightingale mourns constantly, the sweet-voiced nightingale most loves to warble

Source

Spanish (DGE)

adv. ignorantemente Sud., Anecd.Ludw.131.5.