What are other words for "difficult" that I can use?

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What are other words for "difficult" that I can use for both formal and informal writing? 

Jul 8th, 2015

Thank you for the opportunity to help you with your question! Hi, He observes that work expands so as to fill the time available for its completion.

Hi,

the other words for "difficult" or simply synonyms are as follows

hard, tough,laborious,onerous, burdensome,demanding, grueling etc.

thank you. 

Please let me know if you need any clarification. I'm always happy to answer your questions.
Jul 8th, 2015

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Jul 8th, 2015
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Jul 8th, 2015
Sep 24th, 2017
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