This word is smeared without difficulties. And it is leaning towards the word Hard. And this word tough does connate the meaning that the said person when proceeds through a crisis, such a person is hatched because of difficulties which a person does encounter. Btu then this word tough is very lucid, for example it does fall within confined thought of human mind. For example one can say here that such a person had a tough period of tough thinking. Such a word can be referred to human eating. For example one can say that a person has a tough indigestion. Moreover it could be referred to negotiations for example one is able to say that a person had a tough negotiation.

DR.HASHIM S.H. BEHBEHANI