Something that remains unaltered has not changed or been changed.
例句
The rest of the apartment had fortunately remained unaltered since that time...幸运的是，从那时起公寓的其余部分就没有变过。These were my opinions, and they continue unaltered.这是我以前的看法，现在仍旧没有变。
英汉词典释义
adj.
<书>未改变的;未被改变的
to include an unaltered copy of this License包括一个未被改变的本“许可证”的副本。