Theoretical

[Zipporah Schumaker]

Pertaining to theory; depending on, or confined to,
theory or speculation; speculative; terminating in theory or
speculation: not practical; as, theoretical learning; theoretic
sciences.

[Agnes]

Something based on experience; a guess based on what you know.

[Raeanne Dimick]

based on the ideas that relate to a subject, not the practical uses of that subject:

[Michiko]

Concerned with or involving the theory of a subject or area of study rather than its practical application.