The term 'diminish in intensity' can be described by the crossword solutions ABATE (5 letters), WANE (4 letters), BATE (4 letters), FADE (4 letters), and ERODE (5 letters). ABATE means to reduce in intensity or degree, while WANE means to gradually decrease in size, strength, or intensity. BATE is a verb meaning to reduce or lessen in force or intensity, while FADE means to gradually diminish in strength or intensity. Finally, ERODE means to gradually destroy or wear away. All of these words describe a process of decreasing in intensity or strength.