The very idea!

the (very) idea!

An exclamation of shocked disapproval regarding something someone said or did. They thought I would just go along with their plan to cut my pay while taking on more responsibility. The idea! The very idea—how dare you suggest something so horrible!

The very idea!

I do not approve!; That is outrageous! Resignation? The very idea! The very idea! Absolutely not!
See also: very