unthinkable

an unthinkable amount of money.

it was unthinkable that John could be dead.

It would be unthinkable to ask him to do that.

That this project would achieve ultimate success was unthinkable at the time.

It is quite unthinkable that a child like him can speak a foreign language so fluently.

It is unthinkable to ignore climate change.

The idea of going on vacation without packing is unthinkable.

It is unthinkable to skip breakfast.

Forgetting to lock the door is unthinkable.

It is unthinkable to drive without a license.

The thought of quitting halfway through the project is unthinkable.

It is unthinkable to go hiking without proper gear.

The idea of not wearing a seatbelt while driving is unthinkable.

It is unthinkable to live without access to clean water.

The thought of not studying for the exam is unthinkable.