untraceable
adj. 难追踪的(难以发现的；难以描绘的)
近义词：undetectable，indiscernible，imperceptible，invisible，inaudible，faint，traceable，
英英释义
Adjective
- incapable of being traced or tracked down;
"an untraceable source"
例句
- H.G.Wells "invisible man" was invisible and untraceable. 威尔斯的“隐身人”来无影去无踪，难以寻觅。
- God became man to make man God, Untraceable economy! 神成为人，人成为神，天使、世人莫测经纶；
- My business is 100% referral and, thus far,untraceable. 我的生意到现在为止，100%25都是靠介绍，所以是无法追踪的。
- He is calling on that line because he knows it's untraceable. 他打那个电话因为他知道无法被追踪。
- It would have phony license plates and the car itself would be untraceable. 车上的执照牌是假的，凭这辆车要追查车主人也是不可能的。
- He hadn't even kept the letters, but even if he had, they were untraceable. 他甚至没有保存那些信，不过即使他保存了，信也没法追查。