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  1. Dictionary

    la·bo·ri·ous
    [ləˈbôrēəs]
    Origin
    late Middle English (also in the sense ‘industrious, assiduous’): from Old French laborieux, from Latin laboriosus, from labor ‘labor’.
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    Laborious describes something that requires a lot of hard work, such as Victor Frankenstein’s laborious undertaking of digging graves to find monster parts. Laborious comes from the familiar word for work, labor, which doesn’t veer far from its roots in Old French meaning "exertion of the body," and from Latin “toil, pain, exertion, fatigue.”
    Need even more definitions? Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! The meaning of LABORIOUS is involving, requiring, or characterized by hard and sustained effort : arduous. How to use laborious in a sentence.
    www.merriam-webster.com/dictionary/laborious
    adverb An agreement was laboriously worked out. See laborious in the Oxford Advanced Learner's Dictionary Definition of laborious adjective in Oxford Advanced American Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.
    www.oxfordlearnersdictionaries.com/definition/american_…
    1. requiring much work, exertion, or perseverance: a laborious undertaking. 2. characterized by or exhibiting excessive effort; labored. 3. industrious. la•bo′ri•ous•ness, n. Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved. 2.
  3. Laborious Definition & Meaning - Merriam-Webster

  4. LABORIOUS | English meaning - Cambridge Dictionary

  5. LABORIOUS Definition & Usage Examples | Dictionary.com

  6. LABORIOUS | definition in the Cambridge English Dictionary

  7. Laborious - Definition, Meaning & Synonyms | Vocabulary.com

  8. laborious adjective - Definition, pictures, pronunciation and usage ...

  9. LABORIOUS definition and meaning | Collins English Dictionary

  10. Laborious - definition of laborious by The Free Dictionary

  11. laborious adjective - Definition, pictures, pronunciation and usage ...

  12. Laborious Definition & Meaning | YourDictionary