IMPROVABLE
improvable
(adjective) susceptible of improvement
Source: WordNet® 3.1
Etymology 1
Adjective
improvable (comparative more improvable, superlative most improvable)
Capable of being improved.
Capable of being used to advantage; profitable.
Synonyms: serviceable, advantageous
Etymology 2
Adjective
improvable (not comparable)
Impossible to prove.
Source: Wiktionary
Im*prov"a*ble, a. Etym: [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. Sir M. Hale.
I have a fine spread of improvable lands. Addison.
2. Capable of being used to advantage; profitable; serviceable;
advantageous.
The essays of weaker heads afford improvable hints to better. Sir T.
Browne.
– Im*pro"a*ble*ness, n.
– Im*prov"a*bly, adv.
Source: Webster’s Unabridged Dictionary 1913 Edition