Difficult and Nonmaterial

Difficult adjective - Requiring considerable physical or mental effort.

Nonmaterial and difficult are semantically related in immaterial topic. In some cases you can use "Nonmaterial" instead an adjective "Difficult".

Nearby Word: difficulty

Nonmaterial adjective - Not composed of matter.

Difficult and nonmaterial are semantically related in immaterial topic. Sometimes you can use "Difficult" instead an adjective "Nonmaterial", if it concerns topics such as not physical.