Overlook/ˌəʊvərˈlʊk/ Definition 1 of 3Pro Tip 1/3Attention to Detail Used when someone misses small, but important, parts of information. Don't overlook any detail in the contract. Pro Tip 2/3Lost Opportunity Implies missing a chance that could have been beneficial. He overlooked an opportunity and regretted it later. Pro Tip 3/3Not Intentional It suggests that the act of not noticing was unintentional. She accidentally overlooked your name on the guest list.