Improvable
Improvable , adjective
[From Improve.]
1.
Capable of being improved; susceptible of improvement; admitting of being made better; capable of cultivation, or of being advanced in good qualities.
Man is accommodated with moral principles, improvable by the exercise of his faculties.
I have a fine spread of improvable lands.
2.
Capable of being used to advantage; profitable; serviceable; advantageous.
The essays of weaker heads afford improvable hints to better.