An unsubstantiated succession of phenomena, without a centre of unity to which they are referable as qualities, is unintelligible: we cannot have a language of adjectives without nouns.
While he had no business clogging up her life with a potpourri of unsubstantiated garbage, it was equally unfair to have a relationship while holding back the truth from someone you cared for.
The Code admits no claim unsubstantiated by documents or the oath of witnesses.
As yet these claims are unsubstantiated.
When it comes to memory and supplements there's a wide range of choices, but do your research before taking any supplement for memory because many of the claims made are unsubstantiated.