Antonyms for "checked thoroughly" include "briefly inspected," "casually examined," "glanced over," "skimmed," and "scanned quickly." These antonyms suggest a lack of attention to detail and a possible failure to identify important information or potential problems. Other antonyms could include "neglected," "overlooked," "ignored," or "disregarded," referencing a complete failure to analyze or inspect. It's important to keep in mind that a lack of thorough checking can have serious consequences, particularly in professions with high stakes, such as medical practitioners, engineers, and financial analysts. In these cases, it's essential to perform a comprehensive inspection to ensure accuracy and safety.