The term 'most extreme' can be broken down into three crossword solutions: UTMOST (6 letters), DIRESt (6 letters), and NTH (3 letters). UTMOST is an adjective meaning 'the greatest or highest degree or amount possible, ' while DIRESt is an adjective meaning 'the most extreme or serious.' Lastly, NTH is an adjective meaning 'the greatest or highest in degree or order; UTMOST.' All three words are used to describe the most extreme degree of something.