Antonyms for the phrase "gives one an idea" can vary depending on the context. Some possible antonyms could include "confuse," "obscure," "mislead," "bewilder," "flummox," or "befuddle." These words imply a lack of clarity or understanding, and may indicate that an action or statement did not provide insight or inspiration. Other antonyms might include "suppress," "quash," or "stifle," which suggest that an idea was prevented from developing or was actively suppressed by external factors. Ultimately, antonyms for "gives one an idea" reflect a lack of clarity, understanding or insight, and a sense of confusion or uncertainty.