Preposition: of

• youth: Ah yes, the hotheaded impetuosity of youth... ... ... Steve 20-04-2005, 14:57 for example... ... .

Adjective modifier

• youthful: Yet there was no hint of youthful impetuosity or inexperience.

• such: And such impetuosity was equally evident in the speed with which he proceeded to dismiss Germany's great Chancellor, Bismarck.

• characteristic: It was down this road, therefore, that the secretary darted, with characteristic impetuosity, to meet his patron returning home.