cast-off
discarded
throwaway
thrown-away

Throwing away such a good chance to make something of herself!

The whole lot might have been thrown away, I thought.

I see my mother's care has not been thrown away upon you.

Much would have to be thrown away or left for someone else to use.

A. They talked a good deal about being thrown away.

And when there is no further use for them, they can be thrown away.

"The test of a book is how much good stuff you can throw away," he said.

Now it seemed that his care was to be thrown away.

"He's a man whose body has been used up by the system and then thrown away," she says.

"And there is no reason for them to be thrown away."