I'm not sure that is in the dictionary. You can get more consonants with slechtstschrijvend and zachtstschrijdend, which are perfectly normal Dutch words but unlikely to end up in the dictionary (worst-writing and softest-treading). With the transliterated Russian borsjtsj you can get one more: borsjtsjschrokkend (Borscht-devouring).
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I'm not sure that is in the dictionary. You can get more consonants with slechtstschrijvend and zachtstschrijdend, which are perfectly normal Dutch words but unlikely to end up in the dictionary (worst-writing and softest-treading). With the transliterated Russian borsjtsj you can get one more: borsjtsjschrokkend (Borscht-devouring).