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difficult to ...; hard to ...
「難い」 has other readings with different meanings.
この字は読み難いですね。
This character is hard to read.
雨の日は歩き難くて困るよ。
Rainy days are hard to walk on and troublesome.
食べ難い料理は小さく切ってから食べた方がいい。
It's better to cut hard-to-eat food into small pieces.