improvable

From improve +‎ -able.

improvable (comparative more improvable, superlative most improvable)

1. Capable of being improved.
2. Capable of being used to advantage; profitable.

   Synonyms: serviceable, advantageous

From im- +‎ provable.

improvable (not comparable)

1. Impossible to prove.

• improvably

• improbable

• improvable in The Century Dictionary, New York, N.Y.: The Century Co., 1911.
• improvable in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.