unrepeatable
adj
1 that cannot be repeated or done again 不可重复的; 不可再做的
unrepeatable bargains/offers, ie at specially low prices 仅此一次的大减价.
2 too indecent or offensive to be said again (因下流或有攻击性)不宜重述说出的
His remarks were quite shocking unrepeatable, in fact. 他说的话太让人难堪--真无法再说出口.