unofficially
🇺🇸
/ˌʌnəˈfɪʃəli/
🇬🇧
/ˌʌnəˈfɪʃəli/
in a way that is not official or approved by people in charge
He was unofficially helping out at the store, and now he was doing it officially.
not as part of someone's official job or duties
She unofficially started the project before it was approved by the committee.