As an adjective (meaning direct and honest):
* "The doctor's blunt assessment was difficult to hear, but it was the truth."
* "He was known for his blunt humor, which often offended people."
* "I appreciate your blunt honesty even if it's not always easy to swallow."
As an adjective (meaning rounded or dull at the end):
* "She used a blunt knife to spread the butter."
* "The blunt end of the pencil was perfect for shading."
* "He had a blunt, square jawline."
As a noun (meaning a dull-ended tool):
* "He was caught trying to smuggle a blunt weapon into the concert."
* "A blunt instrument like a hammer can be dangerous if used improperly."
* "She used a blunt object to break the window."
As a noun (meaning a marijuana cigarette):
* "They sat on the porch smoking blunts and talking about life."
* "The smell of marijuana and burnt paper gave away their use of blunts."
* "He was caught with a blunt and fined for possession of cannabis."
Remember that the meaning of "blunt" depends on the context.