arduously

adv. laboriously, strenuously; with difficulty; gruelingly

Adverb
1. in an arduous manner; "they worked arduously"
(pertainym) arduous, backbreaking, grueling, gruelling, hard, heavy, laborious, punishing, toilsome

(adv.)
In an arduous manner; with difficulty or laboriousness.
  

arduously /'ɑ:djuəsli/
phó từ khó khăn, gian khổ, gay go
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IN MODO ARDUO\RIPIDO\DIFFICILE\SCABROSO\ENERGICO