Withit is a slang word which means being up to date, trendy or fashionable. Its antonyms are outdated, old-fashioned, obsolete, ancient, and passe. The opposite of withit individual is someone who is out of touch with recent trends or disregards them. A person who is not withit may be considered to be conservative or traditional in their values and beliefs. Many people prefer to be withit as it allows them to fit in with the current culture and keep up with their peers. However, those who are not withit may still have their unique style and be confident in their individuality.