be hard to do, be difficult to do
この単語は発音しにくい。
This word is difficult to pronounce.
それは表現しにくいですね。
That's hard to put into words.
エスペラントは習得しにくいですか。
Is Esperanto difficult to learn?
説明しにくい?
Is it hard to explain?
— どん底作家の人生に幸あれ! (2019)
イメージしにくい。
It's hard to imagine.