Table 2 summarizes the properties of the alternative classification (for a more thorough discussion of previous research on the semantics of adjectives and more motivation for the classification, see (Boleda 2007)). For comparison, we will briefly outline the treatment of adjectives in WordNet (Miller 1998; Alonge et al. 2000). As mentioned in Section 2, the main semantic relation around which adjectives are organized in WordNet is antonymy. Also as explained, however, not all adjectives have antonyms. This is solved in WordNet by the use of indirect antonyms (e.g., swift and slow are indirect antonyms, through the semantic similarity between swift and fast). Still, indirect antonymy only applies to a small subset of the adjectives in WordNet (slightly over 20% in WordNet 1.5). Therefore, some kinds of adjectives receive a differentiated treatment.