What is '치 않다'? Is it different from '지 않다'? What is '아니하다'/'안하다'/'않다'?

1.
치 않다 = 하지 않다

심심하지 않다 = 심심치 않다
만만하지 않다 = 만만치 않다
심상치 않다 ...

However, '치 않다' is not used a lot. (Almost zero) in daily life.
You might see it on the book, news, or etc.

2.
아니하다  > 안하다 > 않다

They are all the same.

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