speculative philosophy

noun2

1. •
   Philosophy, especially traditional metaphysical philosophy, which makes claims that cannot be verified by everyday experience of the physical world or by a scientific method.

   • Speculative philosophy is the endeavour to frame a coherent, logical, necessary system of general ideas in terms of which every element of our experience can be interpreted. — 1929
2. •
   A particular philosophical school, system, or work representative of this kind of philosophy.