佶屈聱牙　

◎ 佶屈聱牙 jíqū-áoyá

[difficult to pronunce or comprehend;be full of difficult and unpronounceable words] 字晦涩难解,不通顺畅达

佶屈聱牙的古书在青年实在不易理解,只徒糜费时日。——郭沫若《王阳明礼赞》