Antonyms for the phrase "thinks up" include "forgets," "neglects," "ignores," "rejects," and "denies." These antonyms all imply a lack of imagination or creativity, as well as a failure to consider alternatives or think critically. While "thinks up" suggests the ability to generate new ideas and solutions, its antonyms suggest stagnation or a lack of innovation. It is important to recognize these antonyms in order to avoid becoming complacent and to challenge oneself to continue thinking critically and creatively. By embracing curiosity and exploring new possibilities, we can avoid the pitfalls of forgetting or ignoring important ideas and opportunities.