Lexical data base building can be considered an essential task for Natural Language Processing (NLP), since the data included can be used in numerous tools, such as Parsers, Semantic Role Labelers, automatic translators, ...

Among the most important lexical semantic relations to the class of adjectives is antonymy, i. e., opposition of senses as in fat/thin . WordNet, a lexical database for English, both establishes semantic relationships ...