The issue raised in this study touches upon different aspects related to expression of negative judgment in medical discourse. This issue lies within the boundaries of speech genre theory. The authors use analysis tools of such disciplines as functional linguistics, medical rhetoric and elocutary mastery. The comparison of accusation and reproach – two related to each other speech genres of expressing disapproval – is made in the introduction to the article. Lexicographic sources allowed to reveal essential semantic peculiarities of these genres.