Being what is needed without being in excess
Of moderately good quality but less than excellent
See syn. study at
We agreed the set up was adequate and thanked him for his efforts.
The prince's character was not attractive, and the king refused to make him an adequate allowance.
Where then can we find an adequate supply of heat?
Most days were blessed by a sun that warmed you enough that a couple of heavy sweaters were more than adequate outer wear.
We may accept Dorner's definition as adequate and satisfactory.