gullible has offended too many dumb people in society that it has in fact been removed from all WEbster dictionaries.
Well i think it is because it said in the book frindle
well you can 'take' their nose
If someone is gullible that means that they are easy to fool or easy to cheat.
gull like a seagull and ible like anything that has -ible at the end like indistructible gull-i-bull
A Thesaurus.