Talk:Inexpugnable-class tactical command ship

Should it not be 'Inexpungable'?
As far as I am aware, the word "Inexpugnable" is mentioned only once in canon (in the Knights of the Old Republic Handbook). If this is the case, I suspect that may be a misspelling in that publication. I know the word 'expunge' means 'to delete or remove', and while I have not found 'inexpungable' in any dictionary, it seems clear that it might be used to mean 'cannot be deleted or removed'. I've no idea what 'inexpugnable' might mean, though, hence my suspicions. Can anybody shed any light on this?