throw-away

throw-away
adj [attrib 作定语]
(a) intended to be discarded after use 使用後丢弃的; 一次性使用的
    throw-away cups, tissues, razors 一次性杯子、 纸巾、剃刀.
(b) spoken in a deliberately casual way; not emphasized 故意脱口而出的; 漫不经心说出的
    a throw-away remark 脱口而出的话.

牛津英汉双解词典