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The Collaborative International Dictionary
Operosely

Operose \Op"er*ose`\ a. [L. operosus, fr. opera pains, labor, opus, operis, work, labor.] Wrought with labor; requiring labor; hence, tedious; wearisome. ``Operose proceeding.''
--Burke. ``A very operose calculation.''
--De Quincey. -- Op"er*ose`ly, adv. -- Op"er*ose`ness, n.

Wiktionary
operosely

adv. In an operose manner.