What does "overzealousness" mean?

The quality of being too zealous

Overzealousness

Common synonyms include: bibliolatry, bigotry, carelessness, charismatic movement, determination, dogmatism.

noun

noun ·Rare ·Advanced level

Noun

1
The quality of being too zealous uncountable
"Many Gazans scorn Fatah as corrupt and incompetent, and they dislike Hamas's overzealousness and repression."
2
The quality of being excessively zealous. wordnet

"Many Gazans scorn Fatah as corrupt and incompetent, and they dislike Hamas's overzealousness and repression."

From overzealous + -ness.