The full sentence would be いいえ、辞書{じしょ}を使{つか}っては駄目{だめ}です, literally translating 'No, you cannot use the dictionary. You could also say いけません or なりません in place of 駄目{だめ}; all three can also be used in plain form, as 駄目{だめ}だ, いけない, and ならない.
Angelos
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