The act of "making a deal" typically involves negotiating an agreement between two or more parties. However, there are certain antonyms that suggest the opposite of this action. For instance, "rejecting an offer" implies that one has declined a proposition without reaching a mutual understanding. Another antonym could be "failing to communicate," which implies that parties involved did not even attempt to start a discussion. "Refusing to bargain" also denotes unsuccessful negotiations, as one party may not be willing to compromise. Lastly, "ignoring a proposal" indicates a lack of interest or attention, emphasizing the importance of effective communication and negotiation skills to succeed in deal-making.