Resembling or containing dunes; characterized by sand dunes; sandy and hill-like.
From 'dune' (a sand hill, from French 'dune', originally from Dutch 'duin') plus the English adjective suffix '-y'. This productive suffix turns nouns into descriptive adjectives (like 'sandy' or 'rocky').
The word 'duny' is geographically specific—it's the kind of word you'd hear near coasts and deserts where dunes are common, and it reminds us that English is constantly generating new adjectives to describe local landscapes.
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