What is the opposite word for finally?

There isn't a single perfect opposite for "finally," as the word's meaning depends on context. However, here are some possible options depending on the situation:

If "finally" implies a long wait:

* Initially

* At first

* Previously

* Before

If "finally" implies an end to something:

* Initially

* At the beginning

* Previously

* Before

If "finally" implies a change of state:

* Initially

* At first

* Previously

* Before

If "finally" implies a sense of relief:

* Unhappily

* Sadly

* Regrettably

* Unfortunately

The best opposite will depend on the specific context and the intended meaning.