Learner's definition of SUFFICIENT
[more sufficient; most sufficient]somewhat formal
: having or providing as much as is needed
A brisk walk is sufficient to raise your heart rate.
A 15 percent tip is sufficient. [=adequate]
There must be sufficient funds in your bank account to cover the check.
Her explanation was not sufficient to satisfy the police.
— sufficiency/səˈfɪʃənsi/noun,pluralsufficiencies[count, noncount]