unrepeatable
adj
1 that cannot be repeated or done again 不可重復的; 不可再做的
unrepeatable bargains/offers, ie at specially low prices 僅此一次的大減價.
2 too indecent or offensive to be said again (因下流或有攻擊性)不宜重述說出的
His remarks were quite shocking unrepeatable, in fact. 他說的話太讓人難堪--真無法再說出口.