The word "onceover" refers to a quick examination or a brief inspection of something. The antonyms of "onceover" include thoroughness, scrutiny, and examination. A thoroughness check is a detailed and meticulous analysis of an object, while scrutiny is the process of examining something closely, especially to detect flaws or errors. An examination is a detailed inspection or assessment of something. Using these antonyms instead of "onceover" conveys a sense of careful consideration and attention to detail, ensuring that nothing is overlooked or missed. So, next time, instead of giving something a quick "onceover," take the time to examine it thoroughly and give it the attention it deserves.