The word "discardable" refers to something that can be thrown away or disposed of without regret or concern. Synonyms for "discardable" include disposable, expendable, and throwaway. Something that is disposable is designed to be used once and then thrown away, such as a paper plate or a disposable razor. Expendable refers to something that can be sacrificed for a greater good or cause, like a soldier in a war. And throwaway is an informal term that refers to something that is not worth keeping or holding onto, like a cheap toy or a piece of junk mail.