The paper is oriented diachronically. It presents the semantic categorical characteristics of the Slavic participium praeteriti passivi (PPP) and their evolution in Polish and in Macedonian through the functional analysis of some periphrastic constructions founded on the base of the PPP. The main subject of the discussion is the diathetical characteristic of the PPP. The analysis leads to the conclusion that PPP (as also some other deverbatives qualified in the frame of the traditional grammatical terminology as participles, i.e. regular members of the verbal system) in particular Slavic languages are subject to different semantic and derivational constraints and, consequently, from the Common Slavic point of view should be treated simply as deverbal adjectives.