1. skillful at eluding capture 逃避的；难捉摸的

2. difficult to describe 难懂的

inclusive

elusive character 不可捉摸的性格

Cambridge IELTS 10，Page 142

Echo is being rather elusive this year and hasn't yet been sighted by our observers.

参考译文：

剑桥雅思 10，第142页

Echo（海豚名）今年不太好找，我们的观察员一直没发现她。