the mind > emotion > excitement > excitability of temperament > [adverb]
the mind > emotion > passion > ardour or fervour > [adverb] > in an inflaming manner
1816 J. Scott xi. 393 A light, ill-informed, inflammably-constituted public mind.
1922 J. Joyce iii. xvii. [Ithaca] 684 The same concupiscence, inflammably transmitted first with alarm, then with understanding.