be deliberately mystifying;deliberately turn simple matters (/things) into mysteries; purposely make a mystery of simple things ❍ 严醉稍微停了一下，也就不再～，他的语调完全成了职业性的谈话。(罗广斌、杨益言《红岩》514)Yan Zui paused. Then he stopped beating around the bush and his manner abruptly became professional./“给你个任务，你干不干？”他～地问。(陶承《我的一家》53) “I’ve a job here. Will you do it? ”He purposely sounded a bit mysterious.
故弄玄虚gu nong xuan xu
purposely make a mystery of simple things
故弄玄虚
purposely turn simple things into mysteries;be deliberately mystifying …建议同中国会谈是～。…is simply putting up a show by proposing to hold talks with China.
故弄玄虚ɡù nònɡ xuán xū
玄虚：指让人不可捉摸的东西。故意耍花招使人迷惑不解。be deliberately mystifying, kick up a cloud of dust