In a frank or candid manner, especially in a way that may seem too open, excessively honest, or slightly blunt.
"Frankly speaking about his mistake made him look incredibly rude to the entire group."
In plain English: Frankly means speaking your true thoughts without hiding anything or trying to be polite about it.
"Frankly, I am not sure if we can finish this project on time."
Usage: Use frankly to introduce direct statements when you want to emphasize complete honesty without sugarcoating the truth. It often signals that what follows might be uncomfortable but is necessary for clarity.
The word frankly comes from adding the suffix "-ly" to the adjective frank. It entered English as a straightforward adverb meaning "in an open and honest manner," reflecting its original sense of being free from deception or reserve.