difficult, hard

形容詞 difficult:

1. not easy; requiring great physical or mental effort to accomplish or comprehend or endure
   同義詞：hard
2. requiring much effort and trouble
3. difficult to manage or control
   同義詞：unmanageable

1. The quest for gold was difficult.
   尋找金礦是很困難的。
2. So far as English is concerned, it is not so difficult as you might think.
   就英文而言，它并不像你所認為的那樣難。
3. The child is going through a difficult phase.
   那孩子正經(jīng)歷困難的階段。
4. It's difficult to recruit teachers of quality.
   要聘請到素質(zhì)好的老師是很困難的。
5. I think he conducted himself admirably, considering the difficult circumstances.
   考慮到那種困難的情況，我認為他的表現(xiàn)令人欽佩。
6. It was difficult for us to decide which road to take.
   對我們來說，很難決定走哪一條路。
7. He found it difficult to stop smoking.
   他覺得戒煙是件難事。
8. She is just being difficult.
   她正在鬧別扭呢。

dif.fi.cult

adj.（形容詞）
Hard to do or accomplish; demanding considerable effort or skill; arduous:
難的：做或完成都很困難的；需要相當(dāng)大的努力或技巧；艱難的：
例句：
.To entertain is far more difficult than to enlighten.(Anthony Burgess)See Synonyms at hard
.理解比知道難得多.(安東尼·伯吉斯)參見 hard

Hard to endure; trying:
困難的：難以忍受的；艱難的：
例句：
fell upon difficult times.
困難時期

Hard to comprehend or solve:
難以理解或解決的：
例句：
a difficult puzzle.
難解的謎語

Hard to please, satisfy, or manage:
不滿的：難以滿意、滿足或管理的：
例句：
a difficult child.
難管教的小孩

Hard to persuade or convince; stubborn.
難弄的：難以說服的或信服；固執(zhí)

來源：
Middle English
中古英語
back-formation from difficulte [difficulty] * see difficulty
源自 difficulte的逆構(gòu)詞 [困難] *參見 difficulty

【引伸】
dif.ficult.ly
adv.（副詞）