theoretical (adj.)

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