gobbledegook

gobbledegook , gobbledygook /ˈgɒb.l ̩.di.guːk/ /ˈgɑː.bl ̩-/ noun [ U ] informal disapproving

language, especially used in official letters, forms and statements, which seems difficult or to mean nothing because you do not understand it

This computer manual is complete gobbledegook. 

即廢話