·adj Wrought with labor; requiring labor; hence, tedious; wearisome.
ŏpĕrōsē, adv., v. operosus fin. ...
A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
operōsē adv. operosus, painfully, laboriously, carefully : fieri: vina condita, O. ...
An Elementary Latin Dictionary