a shortage (the usual word)

insufficiency, scarcity

to fail to perform a duty, to appear (e.g. in a law court) or to a debt

failure; want

an amount by which something, especially a sum of money, is too small

shortage of something needed, required

(an instance of) being unsuccessful

lack of success

the state of being imperfect; a fault (the usual word)

flaw

the lack of power or means

disabling lack of talent, skill

ineffectuality

ineffectuality

being incompetent

lack of ability

an absence of or need for (something)

deficiency, need

a very small payment

small amount

the state of being poor

want; extreme need, often financial

deficiency, need

deficiency, need

(an amount caused by) not having enough

deficiency

an amount by which a supply etc is not enough

deficit; imperfection

deficiency

deficiency