i Register
In some senses, officially is marked as slang. Watch for register when choosing this word.
adv
In an official manner; according to official rules or regulations.
[T]here was nothing to drink except orange crush - officially.
Wearing his best suit and sunglasses, the sultan of Slowjamastan officially declared independence from the United States of America at 12:26 p.m. on December 1, 2021 as he broadcast the secession live from his open-air government “office” in Dublândia, the capital of the Republic of Slowjamastan.
Thoroughly, completely.
That’s it! I’m officially outraged.