Antonyms for "having the impression" may include words such as "uncertain," "ignorant," "uninformed," "unaware," "unperceptive," and "insensible." These words illustrate the lack of knowledge or perception that contrasts with the notion of "having the impression." Furthermore, antonyms for "having the impression" could involve words such as "disbelieving," "misunderstanding," "rejecting," "denying," "doubting," or "disregarding." These antonyms highlight the conflicting viewpoints or beliefs to the notion of "having the impression." Therefore, the use of these antonyms portrays the contrast between the understanding or perception of a situation, event, or idea, and its absence or rejection.