Oh my - didn't realise I was supposed to rhyme!

A noun used as an adjective
Will cause some to grieve
And obfuscate the issue
Did you really mean 'naive'?
A bit nieve's a little hand, in Scots
Or perhaps a hand was bit
Whatever 'twas whoever meant
The meaning's gone to...SHAving cream...

(Sorry, I get like this sometimes when I have a migraine.)