Final answer:
The best antonym for 'cognizant' is 'unaware'.
Step-by-step explanation:
In paragraph 2, the best antonym for 'cognizant' is unaware. 'Cognizant' means being aware or having knowledge of something, so the opposite would be lacking awareness or knowledge. An example sentence using 'cognizant' could be: 'She was cognizant of the potential risks involved.' On the other hand, an example sentence using 'unaware' could be: 'He was unaware of the impending danger.'