inconsistentin•con•sis•tent /ˌɪnkən'sɪst(ə)nt/

adj

1. 不一致的；矛盾的；不一贯的

• What he says is quite inconsistent with what he does. 他的言行很不一致。

2. 反复无常的

• His work is rather inconsisitent - sometimes it is good and sometimes it is awful. 他的工作表现反复无常，时好时坏。