The phrase "enigmatic scale" refers to a musical scale that sounds mysterious or puzzling in nature. Some synonyms for this term include "melancholic scale," "mystifying scale," and "intriguing scale." These terms all describe a musical scale that is difficult to understand or interpret, and may evoke a sense of wonder or confusion in the listener. Other possible synonyms for "enigmatic scale" might include "cryptic scale," "puzzling scale," "inscrutable scale," or "enigmatic mode." These terms all convey a sense of complexity and mystery in the music, suggesting a level of depth and intricacy that requires careful study and interpretation to fully understand.