The word "dichotomic" refers to the division of a whole into two parts, and "most dichotomic" suggests a pronounced contrast or polarization between those parts. Synonyms for this phrase might include "highly polarized," "extremely bifurcated," "markedly divided," or "deeply dichotomized." Other possibilities could include "strongly separated," "sharply differentiated," "distinctly bifocal," or "radically opposed." Whatever term is used, the implication is that the two opposing parts of the whole are separated by a sharp or definitive boundary, creating a striking contrast that is difficult to reconcile or combine.