be insufficient

See: lack
References in classic literature ?
It is possible that these may all be insufficient to control the caprice and wickedness of man.
Seven years would be insufficient to make some people acquainted with each other, and seven days are more than enough for others.
When money is insufficient at one place, they will still be insufficient when they transfer to another place," he said.
Yet even that amount of death seems to be insufficient revenge for the US.
For some musicians, however, the use of the techniques described above may be insufficient.
If such data prove to be insufficient, telephone surveys may be conducted and, if necessary, on-site visits made by Federal Reserve staff to conduct interviews.
Most Medicaid payment) effectively denies access, but even extending significant financial carrots may be insufficient to stimulate the supply of services in some settings.