"inadequacy by" is a grammatically correct phrase and can be used in written English.
Example: The company's failure to meet its targets was caused by the inadequacy of its resources.
Mr. Freeh, who as director often asserted the bureau's capability to combat crimes of all kinds, today acknowledged some inadequacy by the bureau.
"It's somebody who pretends to be someone who he isn't and pretends to have skills that he doesn't have," Stone said, adding that it's not unusual for this type of person to be law-abiding in all other areas of life: "It's someone who you would speculate is making up for feelings of inadequacy by being overtly generous and ingratiating".
Pinterest culture can generate feelings of inadequacy by creating a pressure to throw elaborate birthday parties, attempt intimidating DIYs and bake picture-perfect cupcakes.
We have tried to ameliorate this inadequacy by defining an optimal range.
This avoided interview inconsistency, and data flaw and inadequacy by appointing outsider person as the interviewer.
It is possible to reduce inadequacy by applying measures based on prior analysis of the situation in each hospital.
"Because I was permanently confused, dissatisfied, unhappy, tormented by inadequacy, driven by wanting towards every kind of impossible future, the attitude of mind described by 'tolerantly amused eyes' was years away from me.
When Kaká was withdrawn, his press agent attacked Pellegrini on Twitter as a "coward who hides his own inadequacies by pointing at others".
They felt that in comparison with men like Seward and Chase, Lincoln was a political pygmy, a backwoodsman, still largely unknown, and a speaker who tried to conceal his inadequacies by telling homespun stories.
Moreover, it could not make good its inadequacies by borrowing in times of special need; Nero's need to harry his millionaire subjects with false charges of treason in order to pay for his incredibly expensive court and spendthrift impulses reflects the realities of raising revenue.
Distributed generation (DG) looks to remedy these inadequacies by producing power close to its point of consumption, often utilising carbon neutral, renewable energy (RE) sources (sun, wind).
