Difficult and Unreadable

Difficult adjective - Requiring considerable physical or mental effort.

Unreadable and difficult are semantically related In some cases you can use "Unreadable" instead an adjective "Difficult".

Nearby Word: difficulty

Unreadable adjective - Incapable of being read or deciphered.

Difficult and unreadable are semantically related in dull topic. Sometimes you can use "Difficult" instead an adjective "Unreadable".