Incapable of being overcome or surmounted.
Not usable as legal tender.
Incapable of being passed over, crossed, or negotiated.
To make lean.
Poor, deficient or inferior in amount, quality or extent
Of a set: such that, considered as a subset of a (usually larger) topological space, it is in a precise sense small or negligible.
Having little flesh; lean; thin.
Dry and harsh to the touch (e.g., as chalk).