inexperience

The adjective referring to wisdom is wise.

There is not specific collective noun for the noun ignorance. The noun ignorance is an uncountable noun; quantities of ignorance are expressed in degrees, for example, some ignorance, much ignorance, total ignorance, etc. A term that expresses ignorance as a collective would be, 'the collective ignorance of a group' or 'the combined ignorance of a group'.

There is an inherent problem with this quote as it fails to recognize that ignorance itself is a form of error. Believing in nothing does not make one closer to the truth, as understanding and knowledge are necessary to attain a better understanding of the world. It is important to seek truth, rather than settle for ignorance or incorrect beliefs.

Ignorance