Notional
Part of speech: adjective
Definition: Of, containing, or being a notion; mental or imaginary. Speculative, theoretical, not the result of research. Having descriptive value as opposed to a syntactic category. Of, containing, or being a notion; mental or imaginary.
Speculative
Part of speech: adjective
Definition: Characterized by speculation; based on guessing or unfounded opinions.
Example sentence: It's OK to pursue speculative ideas because we don't want to be too cozy and safe and assume that we know everything about life in the universe. However, we have to be rigorous and careful and honest and logical and scientifically meticulous when we speculate.