我仍旧感到能力不足，毫无用处，混淆不清。

I still feel inadequate, useless and mixed up.

老师正在讲解我们原因混淆不清的问题。

The teacher is explaining what we were confused about.

今天，人们对于戴帽礼仪认识的混淆不清正在导致一些尴尬局面的出现。

Today, confusion over the rules of hat wearing is leading to some awkward situations.

爱情使是非概念混淆不清；强烈的爱情和骄傲的野心都是没有疆界的。

Love is the concept of non confusion; strong love and pride ambitions are no boundaries.

长期以来，国内外学术界对清中期南疆各驻防城市的称呼各异，满城、汉城或其他称呼均有，极易使人混淆不清。

There are different names for the garrison cities of Southern Xinjiang since 18th century, including "Manchu city" , "Han city" and others, thus, they are easy to be confused with each other.