amendable — to alter, modify, rephrase, or add to or subtract from (a motion, bill, constitution, etc.) by formal procedure: Congress may amend the proposed tax bill.
commendable — If you describe someone's behaviour as commendable, you approve of it or are praising it.
dependable — If you say that someone or something is dependable, you approve of them because you feel that you can be sure that they will always act consistently or sensibly, or do what you need them to do.