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Synonyms
la·bo·ri·ous (lə-bôŕē-əs, -bōŕ-)

[Middle English, from Old French laborieux, from Latin labōriōsus, from labor, labor.]

adjective 

  1. Marked by or requiring long, hard work: spent many laborious hours on the project.
  2. Hard-working; industrious.

derivatives

la·bóri·ous·ly
adverb
la·bóri·ous·ness
noun