difficult to ... (physically or emotionally); hard to ...
「辛い」 has other readings with different meanings.
この字は読みづらいね。
This character is hard to read.
言いづらいことでも正直に伝えた。
I conveyed even things that were hard to say honestly.
狭くて歩きづらい道を毎日通っている。
I walk down a narrow, hard-to-walk road every day.