The word "dementing" refers to a state of mental decline and confusion. There are several antonyms for this word that describe mental clarity and sharpness. One such antonym is "lucid," which means clear and easily understood. Another antonym is "sane," which means having a sound mind and able to think clearly. "Cognizant" is another antonym that refers to being aware and conscious. "Rational," "logical," and "sensible" also serve as antonyms to "dementing" and describe the ability to think and reason clearly. Moreover, the antonyms for this word provide a stark contrast to the loss of cognitive function and can help express the opposite of this debilitating state.