What is another word for Arduous in english

The list of words which can be used for Arduous while creating sentence in english language. uphill onerous trying tough grueling trying, excruciating, torturous, punishing, backbreaking backbreaking exhausting, laborious, arduous, grueling, hard, punishing tiring exhausting draining, tiresome, taxing, wearing, fatiguing, wearying burdensome onerous, taxing, demanding, oppressive, difficult strenuous formidable dreadful, intimidating, imposing, dangerous, impregnable rigorous troublesome laborious onerous, backbreaking, arduous, burdensome, strenuous painful harsh hard, grim, severe, rigid, sharp, bitter, strident, bleak heavy bulky, huge, excessive, awkward, unwieldy, big, fat, large labored contrived, awkward, arduous, strained, ponderous, clumsy murder homicide, lynching, massacre, felony, crime, destruction punishing rough severe taxing toilsome fatiguing no picnic 
Usage of Arduous in sentences
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