"Most devised" is a phrase that refers to the act of creating or coming up with something that is highly innovative or ingenious. Synonyms for this phrase could include "most inventive", "most creative", and "most original". Other possible synonyms might include "most resourceful", "most clever", and "most imaginative". Each of these words communicates the idea that someone has worked hard to come up with a new idea or solution that is unlike anything that has come before it. Whether you are talking about a product, a piece of art, or a complex strategy, the phrase "most devised" can help to convey the sense of ingenuity that went into its creation.