Out of Style is a term used to describe something that is no longer fashionable or popular. The antonyms for this term would include trendy, fashionable, stylish, in vogue, modern, hip, and up to date. If something is in style, it means that it is current and relevant. This could apply to anything from fashion to technology. Something that is fashionable may be considered trendy, and therefore modern and up to date. To be stylish, something must have an innate sense of elegance and grace, and to be hip is often characterized by innovation and creativity. Therefore, it's essential to stay updated on the latest trends and styles to remain relevant and in vogue.