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