In Japanese language education, if you do not understand the nuance of a word, or the semantic evaluation nature of an expression subject, it is possible that the word cannot be used correctly. The purpose of this paper is studying the semantic evaluation nature of the synthetic adjective ”-fukai”. ”fukai” is a dimension adjective and there is much usage in which neutral evaluation is expressed. However, the synthetic adjective ”-fukai” by it has also expressed plus evaluation, and has also expressed minus evaluation. According to the result considered by this research, many ”-fukai”, semantic evaluation nature is influenced by the preceding clause ingredient.