The term 'most intense' can be described by two crossword solutions: 'keenest' and 'densest'. 'Keenest' is an adjective that means having or showing a great enthusiasm or eagerness. It is often used to describe someone who is very passionate about something. 'Densest' is an adjective that means having the greatest amount of mass in a given volume. It is often used to describe something that is very compact or concentrated.