Improvable

im·prove  (m-prv)

v. im·proved, im·prov·ing, im·proves

v.tr.

1. To raise to a more desirable or more excellent quality or condition; make better.

2. To increase the productivity or value of (land or property).

3. To put to good use; use profitably.

v.intr.

1. To become better.

2. To make beneficial additions or changes: improve on the translation.

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[Middle English improwen, to enclose land for cultivation, from Anglo-Norman emprouwer, to turn to profit : Old French en-, causative pref. (from Latin in-; see in-²) + Old French prou, profit (from Late Latin prde, advantageous; see proud).]

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im·prova·ble adj.

im·prova·bly adv.

Synonyms: improve, better¹, help, ameliorate
These verbs mean to advance to a more desirable, valuable, or excellent state. Improve and better, the most general terms, are often interchangeable: You can improve (or better) your mind through study; I got a haircut to improve (or better) my appearance.
Help usually implies limited relief or change: Gargling helps a sore throat.
To ameliorate is to improve circumstances that demand change: Volunteers were able to ameliorate conditions in the refugee camp.

Thesaurus

Adj.

1.

improvable - susceptible of improvement corrigible - capable of being corrected or set right; "a corrigible defect"; "a corrigible prisoner"