Workable and Constructive

adjective

• Capable of being done with means at hand and circumstances as they are.
  • synonyms: feasible, executable, practicable, viable

(a.) Capable of being worked or worth working; as, a workable mine; workable clay.

adjective

• Constructing or tending to construct or improve or promote development.
  • usage: "constructive criticism"; "a constructive attitude"; "a constructive philosophy"; "constructive permission"
• Emphasizing what is laudable or hopeful or to the good.
  • usage: "constructive criticism"

• (a.) Having ability to construct or form; employed in construction; as, to exhibit constructive power.
• (a.) Derived from or depending on, construction or interpretation; not directly expressed, but inferred.