Difficult and Undiscoverable

Difficult adjective - Requiring considerable physical or mental effort.

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

Nearby Word: difficulty

Undiscoverable adjective - Not able to be ascertained; resisting discovery.

Difficult and undiscoverable are semantically related in hidden topic. Sometimes you can use "Difficult" instead an adjective "Undiscoverable".