"Ignorant" = "rude" a Scotticism?

[Drew Danielson]

Other words that share a similar dual meaning with 'ignorant' include

vulgar
base
coarse
crude

each of these words have additional meanings of course, but they all can
be used to mean 'lacking in knowledge' or to mean 'rude'.

As a matter of fact, 'rude' can mean 'lacking in knowledge' in the sense
of 'exhibiting a markéd lack of skills' or 'in a natural, raw state'.

Just some observations, anything that may be construed as analysis is
unintentional and without guarantee.