impossible
/ɪmˈpɒsəbl/adjective
1- not able to occur, exist, or be done不可能发生的, 不可能存在的, 不可能完成的：
a seemingly impossible task
一项看似不可能完成的任务
with infinitive it was almost impossible to keep up with him.要赶上他几乎是不可能的。
1.1
- very difficult to deal with很难处理的, 为难的：
she was in an impossible situation.
她处于为难的境地。
1.2
- informal (of a person) very unreasonable〈非正式〉（人）极端无理的, 毫无道理的：
'Impossible woman!' the doctor complained.
“极不讲理的女人！”医生抱怨道。
词源
Middle English: from Old French， or from Latin impossibilis, from in- 'not' + possibilis （see POSSIBLE）.