The term NOT PROSAIC can be solved by the crossword solution POETIC, which is a six-letter word. POETIC is an adjective used to describe something that is characterized by beauty, imagination, and emotion. It is often used to describe literature, such as poetry, that is written in a creative and expressive way. Therefore, NOT PROSAIC can be interpreted as something that is not mundane or ordinary, but rather something that is creative and imaginative.