~nikui ~yasui and double negatives

Konnichiwa minnasan!

So Ive recently come back to a grammar point that I learned a while ago, and it brought up a question. with the verb postfixes ~yasui and ~nikui (meaning easy to do and hard to do respectively) can you use/conjugate them into thier negative and past negative forms? And more importantly is that even used in common Japanese.

For example
tabenikui: difficult to eat -> tabenikukunai: not difficult to eat
kakiyasukatta: it was easy to write -> kakiyasukunakatta: it was not easy to write

In english I know I use this kind of grammar frequently, but I was curious if its the same in japanese, or would the speaker just use the opposite combination of yasui/nikui instead of using the negative?

e.g. hashiriyasui, instead of using: hashirinikukunai (easy to run, instead of using: not difficult to run)

Thanks for any help,

Dan

P.S. sorry the international language package isnt working on my computer, and I cant type any hiragana/katakana. Hope my examples arent too difficult to read.

I use this almost daily in my conversations with people, so yeah it is commonly used. I believe you can conjugate "yasui" or "nikui" so as to make it in past tense and etc.

When I learned this neat little combo, I was like "Cool, now I can say something is hard/easier without sounding too abrassive".

みなさんこんにちは！

You can definetely say 走りにくくない to say "it's not difficult to run" or 食べにくくない to say "it's not difficult to eat". Of course, you can also use the -yasui ending and say 食べやすい "It's easy to eat" - but both forms are used in everyday Japanese language.

-Sayaka