Dictionary
(n.) Labor; toilsome effort; care or trouble taken; -- plural in form, but used with a singular or plural verb, commonly the former.

Thesaurus
assiduity assiduousness diligence effort elbow grease endeavor energy exertion hard pull industriousness industry long pull might and main muscle nerve and sinew painstaking painstakingness sedulousness thoroughgoingness thoroughness trouble
                                                                                                                                                                                                                                       

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