IPA: /ɪˈfɛkʧuəlnəs/
KK: /ɪˈfɛkʧuəlnəs/
The quality of being able to produce a desired result or effect.
The effectualness of the new policy was evident in the improved performance of the team.
Effectualness → It is formed from "effect" (from Latin "effectus", meaning accomplishment or result) and "-ual" (meaning relating to) and "-ness" (meaning the state of being). The word "effectualness" refers to the state of being effective or producing a desired result.
Think of 'effect' as the result of an action, and when you add '-ual' to relate it and '-ness' to indicate a state, it helps you remember that 'effectualness' means the state of being effective.