Speculative

a.
  1. Given to speculation; contemplative.
  2. Involving, or formed by, speculation; ideal; theoretical; not established by demonstration.
  3. Of or pertaining to vision; also, prying; inquisitive; curious.
  4. Of or pertaining to speculation in land, goods, shares, etc.; as, a speculative dealer or enterprise.
  5. (Finance) More risky than typical investments; not investment grade.