Without any language - it is absolutely impossible, but there always is body language or the language of your profession. For example, a friend of mine once told me how her husband managed to have a conversation about his job with two Italian professionals. Neither of them knew a word in each others language, but they knew their profession well and through that they managed to put their message across perfectly.

It's very difficult. but on the other hand, we need more than languages to understand someone or something.

contrary to what most people think - examples above - linguistic communication is a small part of the overall continuous process of (human) communication. Understanding, misunderstanding, not understanding is not inherent to language itself. It is a different process.

by looking on her/his eyes

yes you can by many way ,by picture (drawing ) ,by body language and by singes .but can not understand every things are deep and also you don't interested in this language and take time to know it. also you don't understand the deep such as Terms and science.