名詞 impossible:

1. something that cannot be done

形容詞 impossible:

1. not capable of occurring or being accomplished or dealt with
2. totally unlikely
   同義詞：inconceivable, out of the question, unimaginable
3. used of persons or their behavior
   同義詞：insufferable, unacceptable, unsufferable

1. It's almost impossible to find him in the immense ocean.
   在無邊無際的海洋中要找到他幾乎是不可能的。
2. It's impossible to tell who will win the next election.
   下屆選舉誰能獲勝無法預知。
3. Apparently impossible feats are now accomplished by science.
   許多看起來不可能的偉大業(yè)績現在已經由科學實現了。
4. Absolutely impossible!
   絕對不可能的！
5. It's impossible for us to finish the work in one day.
   我們在一天之內完成這份工作是不可能的。
6. You are the most impossible person I've ever met!
   你是我遇到的最難以忍受的人！

im.pos.si.ble

adj.（形容詞）
Incapable of having existence or of occurring.
不可能的：不能存在或發(fā)生的
Not capable of being accomplished:
不可能完成的：
例句：
an impossible goal.
不可能達到的目標

Unacceptable; intolerable:
不能接受的；不能忍受的：
例句：
impossible behavior.
不能接受的行為

Extremely difficult to deal with or tolerate:
難應付的：極難處理或忍受的：
例句：
an impossible child; an impossible situation.
討厭的孩子；棘手的狀況

來源：
Middle English
中古英語
from Old French
源自 古法語
from Latin impossibilis
源自 拉丁語 impossibilis
in- [not] * see in-
in- [不] *參見 in-
possibilis [possible] * see possible
possibilis [可能的] *參見 possible

【引伸】
impos.sibly
adv.（副詞）