Difficult and Insubstantial

Difficult adjective - Requiring considerable physical or mental effort.

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

Nearby Word: difficulty

Insubstantial adjective - Being of a material lacking in sturdiness or substance.

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