1.  unreasonable;  unnatural;  unjustifiable
2.  impossible
3.  forcible;  forced;  compulsory
often as 無理に
4.  excessive (work, etc.);  immoderate
5.  to work too hard;  to try too hard
Interjection
Colloquialism
6.  no way;  not a chance;  never;  dream on
7.  irrational