1. (a.) Given to speculation; contemplative.

2. (a.) Involving, or formed by, speculation; ideal; theoretical; not established by demonstration.

3. (a.) of or pertaining to vision; also, prying; inquisitive; curious.

4. (a.) of or pertaining to speculation in land, goods, shares, etc.; as, a speculative dealer or enterprise.

abstract academic adventurous aleatory analytical arguable armchair at issue chancy closet cogitative cognitive concentrating concentrative conceptive conceptual conceptualized confutable conjectural contemplating contemplative contestable controversial controvertible curious debatable deliberating deliberative deniable dicey disputable doubtable doubtful dubious dubitable excogitating full of risk hazardous hypothetic hypothetical ideal idealistic idealized ideational ideative iffy impractical in dispute in doubt in dubio in question inquiring intellectual introspective meditating meditative mental mistakable moot museful musing noetic notional open to doubt open to question pensive pondering postulatory prehensive problematic questionable questioning ratiocinative rational reflecting reflective refutable riskful risky ruminant ruminating ruminative serious sober suppositional supposititious suppositive suspect suspicious theoretical thinking thought thoughtful uncertain unpractical unproved unproven unrealistic unreliable untested untrustworthy venturesome venturous wildcat wistful