untidier , untidiest
If you describe something as untidy, you mean that it is not neat or well arranged.
The place quickly became untidy.
这个地方很快就变得凌乱起来。
If you describe a person as untidy, you mean that they do not care about whether things are neat and well arranged, for example in their house.
I'm untidy in most ways.
总的来说,我是个邋遢的人。