a.

1. 不一致的；不协调的；前后矛盾的[（+with）]
   inconsistent testimony

   前后矛盾的证言

   acts inconsistent with belief

   与信念相悖的行为

2. （在原则、行为等方面）易变的，反复无常的
   He is inconsistent.

   他反复无常。

adj.

1. not staying the same throughout.
   ▸acting at variance with one's own principles or former behaviour.
2. (inconsistent with) not compatible or in keeping with.