Definitions of 'ignorant'; take your pick:
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I wouldn't use it in a derogatory sense when describing people who lack knowledge. It's a factual description. People can't help being ignorant. But I can't quite understand why it is thought better to let them go on being ignorant rather than to enlighten them.
I'd never heard it being used in the sense of 'bad mannered' until I moved to Yorkshire from Essex. It puzzled me a great deal at first until I realised it was probably a shortened version of 'ignorant of good manners'.
So sad I’ve nearly finished last Jilly Cooper
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