Merriam Webster online:
operose

Pronunciation:
\ˈä-pə-ˌrōs\
Function:
adjective
Etymology:
Latin operosus, from oper-, opus work — more at operate
Date:
1662

: tedious, wearisome
— op·er·ose·ly adverb
— op·er·ose·ness noun
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Wörterbuch: Deutsch-Englisch

* langwierig [ˈ~viːrɪç] adj lengthy, protracted (a.

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The American Heritage® Dictionary of the English Language: Fourth Edition. 2000.
 
operose
 
SYLLABICATION:op·er·ose
PRONUNCIATION: p-rs
ADJECTIVE:1. Involving great labor; laborious. 2. Industrious; diligent.
ETYMOLOGY:Latin opersus, from opus, oper-, work. See op- in Appendix I.
OTHER FORMS:oper·osely —ADVERB
oper·oseness —NOUN
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Cassels German-English (hardcopy, not online)

operose, adj. mühsam, beschwerlich,
operoseness, die Mühsamkeit, Beschwerlichkeit
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American Heritage Dictionary (hardcopy 1973)
operose, adj. 1. involving great labor; laborious:
"What an operose business it is to establish a government absoultely new." (Burke), 2) Industrious, diligent.

operosely, adv., operoseness, n.