Based on subjective reactions or feelings; not systematically researched or arrived at.
Impressible.
Based on impression rather than reason or fact; based on trying to impress somebody rather than trying for accuracy.
Pertaining to or characterized by impressionism.
Not rational; unfounded or nonsensical.
Of a real number, that cannot be written as the ratio of two integers.
A real number that can not be expressed as the quotient of two integers, an irrational number.