Difficult and Nonphysical

Difficult adjective - Requiring considerable physical or mental effort.

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

Nearby Word: difficulty

Nonphysical adjective - Not composed of matter.

Difficult and nonphysical are semantically related in immaterial topic. Sometimes you can use "Difficult" instead an adjective "Nonphysical".