throwaway

(not comparable)Disposable; intended for a single use prior to being discarded.

Water was provided in throwaway plastic bottles, but the more ecologically minded of us refilled our initial bottles from the fountain.

intended to be thrown away after use

(not comparable)Extemporaneous; off the cuff.

The host made a throwaway remark about the president that was later repeated on the television news.

(not comparable)Given in a casual manner, either deliberately or unconsciously, with apparent disregard for effect.