potential, contingent, imaginable, doable, thinkable, accomplishable, allegeable, conceivable, feasible, achievable, more...

impossible, implausible, unfeasible, inconceivable, unthinkable

probable, likely, unlikely, impossible, more...

some, other, best, digitalis, precautions, total, lithium, more, oral, impossible, boundless

can be,   able to be,   can be done,   could happen,   can happen,   it can be,   able to be done,   able to happen,   do; feasible,   you can do it