1) not likely to be true or to happen (improbable)

2) situated in the exterior area of; situated along the outer edge of; not likely or probable (outside)

3) firm; not likely to move or change; a building in which horses are kept and fed; a number of horses (especially racehorses) belonging to one particular owner (stable)

4) firmly fixed or supported; not likely to fall over; not changing in amount, speed etc; (of a person behaviour) having, keeping to, a regular (good) pattern (steady)

5) not likely to happen or be true (unlikely)