The expression signifies an entire lack of knowledge. When somebody says one thing is Greek to them, they imply it’s incomprehensible, much like listening to a language they have no idea. For instance, a posh physics equation is likely to be “Greek” to somebody with no science background.
The phrase’s historic roots could be traced again to medieval Latin. Its enduring utilization highlights the human expertise of encountering data or topics which can be completely past one’s grasp. Its worth lies in its succinct conveyance of incomprehension, serving as a relatable idiom throughout varied fields and contexts.