The phrase "concretely speaking" is an accepted and appropriate phrase in written English. You can use it to help clarify or emphasize a point you are trying to make. For example, "Concretely speaking, this policy is not going to be effective unless it is properly enforced.".
Concretely speaking, activists must reorient all efforts around capturing sovereignty.
Concretely speaking, consider an instrument playing notes and consecutively.
Concretely speaking, our nonlinear conjugate gradient algorithms are obtained in the following steps.
Concretely speaking, route bundling has specific applications in environments where resources or means of transport/communication are scarce or expensive.
Howard Dean of Vermont, a doctor, said his fellow Democrats should speak concretely rather than in abstractions, and so link environmental problems with real-world consequences.
"The thing about Melissa & Doug toys," she said, "the problem with them, is they encourage you to be creative, which is great, but they also, speaking of it kind of concretely, are relatively one-dimensional".
Nino doesn't have her best friend Lila's "capacity to make everything fascinating," Elena observes coolly, but he is well informed, and when he discusses issues like poverty, he sounds less like a teen-ager than a man, speaking "not generically, in sorrowful accents... but concretely, impersonally, citing precise facts".
Being a terminologist, I care about word choice. Ludwig simply helps me pick the best words for any translation. Five stars!
Maria Pia Montoro
Terminologist and Q/A Analyst @ Translation Centre for the Bodies of the European Union