[jí qū áo yá]   

诘    屈    聱    牙    诘屈：同“佶屈”，曲折，引申为不顺畅；聱牙：读起来拗口、别扭。形容文字晦涩艰深，难懂难读。

形容文章读起来不顺口。出自唐·韩愈《昌黎先生集˙进学解》

Full of difficult and unpronounceable words

诘戎治兵    诘屈謷牙    诘屈聱牙    诘曲聱牙    诘屈磝碻