Antonyms for the phrase "caused to understand" are limited to two main categories: lack of comprehension and intentional confusion. The former refers to not being able to understand due to various reasons, such as lack of knowledge, language barriers, or cognitive impairment. Other words that may describe this state include ignorance, unawareness, and incomprehension. On the other hand, the latter implies a deliberate act of misleading or deceiving someone. Words such as mislead, deceive, and confuse may fit this category. Furthermore, some other antonyms for "caused to understand" could be vague, misunderstand, and unclear. Expressions such as "created ambiguity" or "created doubt" could also convey the opposite meaning.