adj. 25B6; adjective
it's not possible to check the figures : FEASIBLE, practicable, viable, within the bounds/realms of possibility, attainable, achievable, workable; informal on, doable.
a possible reason for his disappearance : CONCEIVABLE, plausible, imaginable, believable, likely, potential, probable, credible.
a possible future leader : POTENTIAL, prospective, likely, probable.
unlikely.