gobbledegook or gobbledygook /gobˈəl-di-gook/ (orig US sl)

1. Unintelligible official jargon
2. Rubbish, nonsense

• sixth-form college
• sixth-form colleges
• sixth-former
• sixth-formers
• sixth forms
• sixthly
• sixths
• sixth sense
• sixties
• sixtieth
• sixtieths
• sixty
• sixty-four-dollar question
• sixty-fourth note
• sixty-fourth notes
• sixty-four-thousand-dollar question
• sixty-nine
• sizable
• sizably
• sizar
• sizars
• sizarship
• sizarships
• size
• sizeable