What is "unfillable"

Usage examples of "unfillable".

Morowitz has presented the case, in thermodynamic terms, for the hypothesis that a steady flow of energy from the inexhaustible source of the sun to the unfillable sink of outer space, by way of the earth, is mathematically destined to cause the organization of matter into an increasingly ordered state.

This girl, a tube of selflessness running through her as unfillable as those empty Torricellian columns pleading for the United Way.