An object or a person can be blunt, meaning they are straightforward and honest without being polite.
When people talk about something being blunt, they often mean that it's direct and uncompromising. For example, if you ask for advice from someone who always tells you what they think, even if it hurts your feelings, then they might be described as a blunt person. They don't beat around the bush or sugarcoat their words. A friend might say to another, "My sister is so blunt; she just told me I was wearing this ridiculous shirt."
How common is "blunt"?
Word blunt is considered uncommon in modern English. It has a balanced usage among all categories: speech, fiction, newspapers and academic texts.
Definitions
noun
A fencer's practice foil with a soft tip.
A short needle with a strong point.
(smoking) A marijuana cigar.
Example: 2005: to make his point, lead rapper B-Real fired up a blunt in front of the cameras and several hundred thousand people and announced, “I'm taking a hit for every one of y'all!” — Martin Torgoff, Can't Find My Way Home (Simon & Schuster 2005, p. 461)
Money
A playboating move resembling a cartwheel performed on a wave.
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adjective
Having a thick edge or point; not sharp.
Dull in understanding; slow of discernment; opposed to acute.
Abrupt in address; plain; unceremonious; wanting the forms of civility; rough in manners or speech.
Example: the blunt admission that he had never liked my company