inadequacy

As nouns the difference between dearth and inadequacy

is that dearth is a period or condition when food is rare and hence expensive; famine while inadequacy is the state of being inadequate.

As nouns the difference between inadequacy and quality

is that inadequacy is the state of being inadequate while quality is (uncountable) level of excellence.

As an adjective quality is

being of good worth, well made, fit for purpose.

As nouns the difference between shortfall and inadequacy

is that shortfall is an instance of not meeting a quota or of having an insufficient amount while inadequacy is the state of being inadequate.

As nouns the difference between inadequacy and poor

is that inadequacy is the state of being inadequate while poor is with "the" Those who have little or no possessions or money, taken as a group.

As an adjective poor is

with little or no possessions or money.

Incompetenceincompetency is likely misspelled.

Incompetenceincompetency has no English definition.

As a noun inadequacy is

the state of being inadequate.

As nouns the difference between inadequacy and scarcity

is that inadequacy is the state of being inadequate while scarcity is the condition of something being scarce or deficient.

As nouns the difference between inadequacy and flaw

is that inadequacy is the state of being inadequate while flaw is a flake, fragment, or shiver.

As a verb flaw is

to add a flaw to, to make imperfect or defective.

As nouns the difference between lack and inadequacy

is that lack is a defect or failing; moral or spiritual degeneracy while inadequacy is the state of being inadequate.

As a verb lack

is to be without, to need, to require.