unmap

I'm need to unmap a few of my mappings, but for some reason the unmap command doesn't work. To see what mappings I have I enter the following command
:map

The output I get looks like this:
n -x *@dd
n Q *@x

Which led me to believe that -x and Q are mapped in the normal mode. However when I tried running
nunmap Q

I got an error, saying the following
E31: No such mapping.

I also tried running
unmap Q

and I still got an error saying
E31: No such error.

Does anybody know what am I doing wrong?

Any help is appreciated.

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