painfully (adv.)
diligently, taking great pains
KJ II.i.223 [King John to Hubert, of himself] Who painfully, with much expedient march, / Have brought a countercheck before your gates
LLL I.i.74 [Berowne to King, of delights] As painfully to pore upon a book
Tim V.ii.1 [Third Senator to Messenger] Thou hast painfully discovered [or: to painful effect]