POSSIBLY adv.
In a possible manner; by possible means; especially, by extreme, remote, or improbable intervention, change, or exercise of power; by a chance; perhaps; as, possibly he may recover. Can we . . . possibly his love desert Milton. When possibly I can, I will return. Shak.
RESPONSIBILITY n. 3 definitions
The state of being responsible, accountable, or answerable, as for a trust, debt, or obligation.