for‧mal‧ly S3 / fɔməli $ fɔr- / 副词

1 officially 反义词 informally :

We an 名词 ced a decision formally recognizing the new government.

2 in a polite way 反义词 informally :

He put his hand out formally, and Liza took it.

‘I apologize, Captain,’ she said formally.