Easy to read – (Yomu)Yomiyasui desu
Difficult to read – Yominikui desu

When converting to “~yasui” or “~nikui”, the hiragana at the end of the verb shall be changed to the “second sound (a i u e o). Yomu >> Yomiyasui, Kaku >> Kakiyasui. Special verbs such as Suru >> Shiyasui, Kuru >> Kiyasui, Miru >> Miyasui. For more information on how to change for other verbs that end with different hiragana words, please go to our Verbs Section.

It’s easier to study in a quiet room – Shizuka na heya wa benkyō (suru)shiyasui desu
Tofu is difficult to eat – Tōfu wa (taberu)tabenikui desu
It’s not difficult to watch in old television – Furui terebi wa (miru)minikuku arimasen

When you are using negative expression, as usual remove the “i” and change to “ku” follow by “arimasen”