The article presents an analysis of inflexive features of adjective idioms. The analysis proves that majority of adjective idioms are established as indeclinable units (characterized by fully syncretic forms), e.g. pełną gębą, bez serca, od macochy, etc. In other cases, the lack of textual occurrences of certain inflectional gender forms is a result of their semantic, e.g. wiecznie zielony, grubymi nićmi szyty, and not *wiecznie zieleni, *grubymi nićmi szyci.
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