In the question given below, two sentences are given with one blank each. From the given answer choices, choose the option which contains the word that fits in both sentences making them grammatically and contextually correct. 1. Although the treaty appeared balanced on paper, several diplomats privately warned that its provisions were too ______ to withstand prolonged geopolitical pressure. 2. The structural engineer rejected the preliminary design after observing that the support framework remained dangerously ______ under cyclical loading conditions.