laborious

 
Pronunciation: /ləˈbɔːrɪəs/

adjective

  • requiring considerable time and effort: years of laborious training the work is very slow and laborious
  • (of speech or writing style) showing obvious signs of effort and lacking in fluency: she wrote in laborious, dictionary-assisted English

Derivatives

laboriously

adverb

laboriousness

noun

Origin:

late Middle English (also in the sense 'industrious, assiduous'): from Old French laborieux, from Latin laboriosus, from labor 'labour'