From King Dictionary of Contemporary Englishclunkyclunk‧y /ˈklʌŋki/ adjective 1 THICK OBJECT OR MATERIALheavy and awkward to wear or use clunky old shoes2 clunky software is slow or does not work well
Examples from the Corpus
clunkyThere were sports cars and clunky family sedans.With a gawky, clunky gait Magic lurches slowly across the yard.Adding to the problem is the clunky interface.a pair of clunky old bootsOn their own bikes, wearing their unique outfits, contestants will haul clunky parcels between checkpoints.The first models after the war were clunky, retooled versions from 1942.