(a.) Pertaining to theory; speculative\; terminating in theory or speculation: not practical; as, theoretical learning; theoretic sciences.

abstract academic analytical armchair closet conceptual conjectural debatable fanciful hypothetic hypothetical ideal idealized ideational ideological impractical moot notional postulatory problematical pure putative speculative suppositional supposititious transcendent transcendental unproved unproven unrealistic untested