verb · to be wiped out, destroyed, or totally lost, typically used in reference to conscience, humanity, or virtues

由于长期的贫困和压迫，他的良心已经完全泯灭了。

verb · to disappear completely or fade away over time, often referring to traces, memories, or impressions

即使过去了很多年，那段记忆也从未泯灭。