Not sharp, having a dulled
blade or rounded finish,
may be used metaphorically to describe a person who is not subtle in their manner or techniques, or, more pejoratively,
someone who is unsophisticated.
My kitchen
knife was blunt but after I used the new knife sharpener from (insert brand here) it sliced through the tomatoes easily.
Pathologist: "The victim was killed with a blunt instrument"
You: "you
mean a viola or something?"
Pathologist: "no, I
mean a baseball
bat, that one over there actually with all the blood and hair stuck to it".
Q: "...not that I'd expect a blunt instrument like you to manage that without killing everyone Bond"
Bond (James Bond): "Oh fuck off Q you sad old fart"