If "visualize" means to form a mental image:
* Ignore: To disregard or not pay attention to.
* Disregard: To pay no attention to.
* Overlook: To fail to notice or consider.
* Miss: To fail to perceive.
* Obliterate: To destroy completely.
* Abstract: To think in a way that is not concrete or specific.
If "visualize" means to create a visual representation:
* Abstract: To represent something without using specific details.
* Verbalize: To express something using words rather than images.
* Conceal: To hide or keep something from being seen.
* Obscure: To make something unclear or difficult to understand.
If "visualize" means to understand something clearly:
* Misinterpret: To understand something incorrectly.
* Misunderstand: To fail to understand something correctly.
* Confuse: To make something unclear or difficult to understand.
Ultimately, the best antonym for "visualize" will depend on the specific context in which you are using the word.