The antonyms for "brought up to date" involve words that pertain to outdated or obsolete things. These antonyms include outdated, old-fashioned, archaic, antiquated, obsolete, and unfashionable. When something is not brought up to date, it may hinder progress, become unproductive or become irrelevant. Things that are outdated may no longer be useful and may lead to undesirable consequences, such as delays or impediments in work processes. Thus, it's important to keep things up-to-date to ensure optimal function and productivity. Failing to do so may result in wasted time, money, and effort in trying to resolve any issues that may arise due to outdated systems, procedures or equipment.