impressionistic

Pertaining to or characterized by impressionism.

Based on subjective reactions or feelings; not systematically researched or arrived at.

Also, it must be remembered that claims made by Kindersley and Goffin were impressionistic, as opposed to being based on modern linguistic data collection and analysis methods.

Based on impression rather than reason or fact; based on trying to impress somebody rather than trying for accuracy.

Impressible.