IPA: /ˈblʌntli/
KK: /blʌntli/
In a straightforward and direct way, often without concern for politeness or sensitivity.
She bluntly told him that his idea was not good.
Bluntly → It is formed from "blunt" (from Old French *blont*, meaning dull or not sharp) and the adverbial suffix "-ly" (meaning in a manner of). The word "bluntly" means in a manner that is straightforward or direct, often without concern for politeness.
Think of being 'dull' ('blunt') in your speech, which means you are speaking directly and honestly, without sharpness or subtlety.