  Even more problematically for a unified treatment, the treatment of all negatively prefixed adjectives as semantic contradictories would seem naturally to extend from unhappy or unwise to simplex antonymic pairs like happy/sad or wise/foolish, where the evidence for semantic contrariety appears to be incontrovertible. While Krifka (2007: 174) supports the analysis of e.g. happy and unhappy as “literally contradictories that receive their interpretations as contraries only via pragmatic strengthening”, Horn (2017) argues that a traditional (neo-Aristotelian) approach invoking parallel but distinct semantic and pragmatic strengthening processes is on sounder empirical footing.