undermind noun2 •The subconscious mind or self.The doctor assists the undermind, and his assistance is often utterly indispensable: for instance, he "sets" a broken limb, and gives the undermind every assistance, [...] — 1909 •The unconscious mind; intuition.Others have named this "tortoise mind" as intuition, or the unconscious, and the id. Caxton goes on to name it the "undermind." — 2010 formsunderminds