(obsolete or poetic) insubstantial

(archaic) Insubstantial.

Lacking substantiation; without evidence.

simple past tense and past participle of unsubstantiate

In an unsubstantial way.

(grammar) Not having the form of a noun. / Not having any material substance. / (by extension) Not having any factual substance.

A divesting of substantiality.

(rare) In a way that is unsubstantiated.

Synonym of insubstantiality

plural of unsubstantiality