1. 不适合：unsuccessfully 失败地 | unsuitability 不适合 | unsuitable 不适合的
2. 不适当/不相称/不适合：unsuccessfully /失败地/ | unsuitability /不适当/不相称/不适合/ | unsuitable /不适合的/不便/不当/
3. 不适合,不相称,不相配：unsteady;不稳定的,非定常的,不规则的 | unsuitability;不适合,不相称,不相配 | unswaged area;非锻细区段
noun
1. the quality of having the wrong properties for a specific purpose
Synonym: unsuitableness ineptness