(of a liquid 液体 not made weaker by having water added to it; not having been diluted 未掺水的；未稀释的 (of a feeling or quality 感情或品质 not mixed or combined with anything and therefore very strong 真挚的；纯洁的；浓烈的；醇厚的 I looked back on that time with undiluted pleasure. 我回首那段时光并没有感到高兴。