1. 难解的：enigmatic 谜一般的 | enigmatical 难解的 | enigmatize 使成谜

2. 难解的/谜一般的/不可思议的：enigmatic /阴阳怪气的/谜一般的/高深莫测的/ | enigmatical /难解的/谜一般的/不可思议的/ | enigmatize /使成谜/使不可解/

3. 难解的; 谜一般的; 不可思议的 (形)：enigmatic 如谜的; 难以理解的 (形) | enigmatical 难解的; 谜一般的; 不可思议的 (形) | enigmatically 神秘地; 让人捉摸不透地 (副)

adj

1. not clear to the understanding

e.g. I didn't grasp the meaning of that enigmatic comment until much later
prophetic texts so enigmatic that their meaning has been disputed for centuries

Synonym: enigmaticpuzzling