The answers to these questions remain as elusive as ever.

elusive 是形容词，由动词 elude（逃避、躲避）加上形容词后缀 -ive 构成。elude 本身来自拉丁语，意思是"逃避、躲避"。elusive 形容某事物"难以捉摸的、难以理解的"，就像想要抓住却总是抓不住的感觉。