IPA: /ˌɪnɪˈfɛkʧuəli/
KK: /ˌɪnɪˈfɛkʧuəli/
In a way that does not produce the desired effect or result; without success.
She tried to fix the computer ineffectually, as it still wouldn't turn on.
Ineffectually → It is formed from "in-" (meaning not) and "effectual" (from Latin "effectualis", meaning producing a desired effect) and the suffix "-ly" (meaning in a manner). The word "ineffectually" means in a manner that does not produce a desired effect or result.
Think of 'not' ('in-') producing a 'desired effect' ('effectual') — that's why doing something ineffectually means it doesn't work as intended.