Since a thing cannot be destroyed without the action of external forces, motion and rest, too, exist indefinitely until disturbed.

This little world isn't going to exist indefinitely.

With the possibility of stopping on other planets, the four men could exist indefinitely in the ship.

He can exist unprotected in the vacuum of space indefinitely.

It did not exist indefinitely in the past.

The case raises legal and ethical questions brought about, in large part, by technologies that allow embryos to exist outside the body indefinitely.

Life exists; why therefore should not the means of preserving it indefinitely exist also?

They must have existed indefinitely in the past.

With the agreement that was concluded on 2 March last, these bilateral treaties will cease to exist indefinitely.

However, we must also realise that this picture cannot exist indefinitely in areas where there are varying degrees of security.