A constructive discussion, comment, or approach is useful and helpful rather than negative and unhelpful. She welcomes constructive criticism After their meeting, both men described the talks as frank, friendly and constructive = positive negative. useful and helpful, or likely to produce good results
Having ability to construct or form; employed in construction; as, to exhibit constructive power
constructing or tending to construct or improve or promote development; "constructive criticism"; "a constructive attitude"; "a constructive philosophy"; "constructive permission"
emphasizing what is laudable or hopeful or to the good; "constructive criticism"