Synonyms and related words :
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