Insubstantial and Threadbare

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

Threadbare and insubstantial are semantically related in meagre topic. In some cases you can use "Threadbare" instead an adjective "Insubstantial".

Threadbare adjective - Showing signs of advanced wear and tear and neglect.

Insubstantial and threadbare are semantically related in meagre topic. Sometimes you can use "Insubstantial" instead an adjective "Threadbare".