operōsē adv.
operosus, painfully, laboriously, carefully : fieri: vina condita, O.
ŏpĕrōsē, adv., v. operosus fin. ...
A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
·adj Wrought with labor; requiring labor; hence, tedious; wearisome. ...
Webster's Dictionary of the English Language