Insubstantial and Unsound

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

Unsound is a synonym for insubstantial in strong topic. In some cases you can use "Unsound" instead an adjective "Insubstantial", when it comes to topics like weak. popular alternative

Unsound adjective - Having or showing a very abnormal or sick state of mind.

Insubstantial is a synonym for unsound in flimsy topic. You can use "Insubstantial" instead an adjective "Unsound", if it concerns topics such as strong, rickety. popular alternative

Nearby Words: unsounded, unsoundly