Meaning of 読みにくい in Japanese

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Definition of 読みにくい

よみにくい(yominikui) 【読みにくい ·読み悪い ·読み難い】

(adj-i) hard to read; illegible
私の叔父の字は読みにくい。
My uncle's handwriting is hard to read.

専門用語せんもんようごで書いてあるため、この本ほんは実に読みにくいよみにくい。

Written in technical terms, this book is very difficult to understand.