difficult Synonyms

hard burdensome unmanageable arduous troublesome laborious cumbersome grueling trying knotty demanding involved sticky intricate strenuous toilsome tough tricky formidable exacting taxing uphill thorny complicated exhausting painful puzzling awkward complex onerous problematic perplexing challenging tearful problem prickly tangled tall stressful supramundane supermundane sweaty testing pig-headed plicated toilful tiresome tiring precarious tighter