Sentence:  "I don't hear one word in ten that they say," continued Mrs. Abingdon; "it's <WSD>Greek</WSD> to me. However, ..." 
Meaning of the word marked with <WSD> tags:  Unintelligible speech or text, such as foreign speech or text, or regarding subjects the listener is not familiar with, such as mathematics or technical jargon; or statements that the listener does not understand or agree with.