Formally-Formerly | Commonly Confused Words

Formally

/ˈfɔːməli/

In a manner that follows formal rules or customs

He was formally invited to join the board.The law was formally approved last week.She was formally dressed for the gala evening.

/ˈfɔːməli/

Previously known by a different name or in a different state.

'Then it IS the lady as formerly objected?' said Wegg.I was a countryman formerly.""One of the four braves who formerly performed such prodigies."

Formally contains the word form, which can remind you that it relates to formality or official procedures.
Formerly starts with form but notice the er, akin to earlier, hinting at past or previous time frames.
Think of formally as being in a formal setting, like wearing a tuxedo or attending a formal event.
Former in formerly can remind you of before in time, as in formerly known as.
Remember that formality (formally) deals with structured rules, while formerly deals with time.