Here are some confusing words from the book
Treasure Island
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1. Dreadfully meaning extremely unpleasant; distasteful or shocking: dreadful table manners; this dreadful heat.
Villainous
Rheumatic
Overhauled
Summoning
Miscreant
Magistrate
Repugnance
Aloft
Mutineers
Mainstay
Treacherous