How to pronounce dynamic

1a : marked by usually continuous and productive activity or change a dynamic city. b : energetic, forceful a dynamic personality. 2 or less commonly dynamical dī-​ˈna-​mi-​kəl a : of or relating to physical force or energy. b : of or relating to dynamics (see dynamics entry 1)

When we have the word ‘exact’, we will make a True T because it’s part of an ending consonant cluster. But when we add the -ly ending, it now comes between two consonants. You’ll hear a lot of native speakers say ‘exactly‘, with no T sound.