Cognoscentis, meaning experts or connoisseurs, has a few antonyms that describe individuals who lack knowledge or expertise. One antonym is novice, referring to someone who is new or inexperienced in a field. Another antonym is amateur, indicating someone who is not a professional in a particular field or lacks the necessary skills and knowledge. Opposite to cognoscentis, people who lack knowledge may also be described as ignoramuses, meaning they have little or no knowledge about a subject or topic. Finally, there is the antonym layman, referring to an average person who lacks specialized knowledge or expertise.