zealousness
The closure of the society seemed like an act of overzealousness on the part of a single official.
A spokesperson for the organization said that the new requirements were a sign of government overzealousness after the attack.
A teacher from the school said that he was concerned about the over-zealousness of the police and the judiciary.
The two sides accused each other of over-zealousness.

SMART Vocabulary: related words and phrases

Excitement, interest, energy and enthusiasm
alacrity
animation
ardour
avidity
boosterism
commotion
flirtation
frenzy
friskiness
frisson
frolic
get a buzz out of something/doing something
hubbub
pep
perkiness
physicality
piquancy
pizzazz
whirl
zealousness