Meaning of DIFFICULT in English
adj.1 a needing much effort or skill. b troublesome, perplexing.
2 (of a person): a not easy to please or satisfy. b uncooperative, troublesome.
3 characterized by hardships or problems (a difficult period in his life).
difficultly adv. difficultness n.
Etymology: ME, back-form. f. DIFFICULTY
Oxford English vocab. Оксфордский английский словарь. 2012