Similar phrase: my social life was at its most fun in college The singing reaches its loudest point/highest volume at the end Come to think about it. Perhaps “most intense,” “most fun,” “loudest point” are nouns be cause they are a state of being. Intense, fun and loud are, of course, adjectives, but used in this way, the first noun is not so much being described as it is reaching a state of being at a certain time.