insidioso (bn):
misleidend(en) that captures misleadingly., netelig(en) hard to deal with., netelige(en) hard to deal with., perfide(de) mit Niedertracht und in hinterhältiger Weise., sluipend(en) producing serious harm in a stealthy, often gradual, manner., sofistisch(en) that captures misleadingly., verraderlijk(en) producing serious harm in a stealthy, often gradual, manner.
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Via: Memodata.com