IPA: /ˌɪnɪˈfɛkʧuəlnəs/
KK: /ɪnɪˈfɛkʧuəlnəs/
The state of being unable to produce a desired effect or result; lack of effectiveness.
The ineffectualness of the new policy led to widespread disappointment among the citizens.
Ineffectualness → It is formed from "in-" (meaning not), "effectual" (from Latin "effectualis", meaning producing a desired effect), and "-ness" (meaning the state of being). The word describes the state of not producing a desired effect or result.
Think of 'not' ('in-') being able to produce a 'desired effect' ('effectual') — that's why ineffectualness means the state of being ineffective.