When it comes to describing someone who agrees quietly, there are plenty of synonyms that come to mind. Some of the most common ones include 'concurs silently,' 'approves quietly,' 'acknowledges calmly,' 'affirms softly,' and 'consents peacefully.' Other options might include 'endorses discreetly,' 'ratifies quietly,' 'recognizes agreeably,' 'confirms unobtrusively,' or 'admits gently.' Whether you're writing a novel, a news article, or simply trying to find the right words to describe someone who nods their head and goes along with the consensus without speaking up, there are plenty of synonyms for 'agrees quietly' to choose from.