Abstract: 353 undergraduates were asked to designate values experientially, using a method of fuzzy interval evaluation, to forty-eight adjectives of four kinds of basic emotions, that is, happy, anger, sad, and fear, according to their semantics on intensity and complexity separately. The results as below: first, intensity and complexity are two different dimensions for emotion evaluation and the results of semantic fuzzy evaluation to emotional adjectives on them are not necessarily related; secondly, the semantic fuzzy evaluation of both intensity and complexity are fundamentally consistent with the daily-life understanding of the emotional experience represented by those qualifiers, and the scale values from male subjects correlate very significantly to the results of their female counterparts; thirdly, the difference between the male and female on the evaluation basically lies in different ranks and certainties, which was ascribed to their different experiences on emotion and the individual differences among themselves respectively; fourthly, the certainties of the undergraduates’ semantic fuzzy evaluation to the emotional adjectives were rather high as a whole, and the meaning of those adjectives are fuzzy on the two dimensions to some degree; And lastly, hierarchical clustering procedure was run with these four kinds of adjectives in terms of their fuzzy distance measure and phi-square measure computed by the degree of membership of intensity evaluation, and get to similar categories.

Key words: basic emotion, emotional adjectives, semantic fuzzy evaluation, fuzzy clustering