The antonyms for the word "assents to" include "disagrees with," "opposes," "refutes," "rebuts," "denies," "rejects," and "disapproves." These words represent the opposite of agreeing or accepting a particular idea, belief, or proposal. While "assent" implies a positive response or affirmative action, its antonyms indicate a negative or critical attitude towards the same. For example, if someone "assents to" a proposal, another person may "disagree with" it or "oppose" it. The use of antonyms can help to express different shades of meaning and convey a more nuanced message.