The term "in tendances" refers to the state of being in trend or up-to-date. Therefore, antonyms for this phrase would be words that signify being outdated or old-fashioned. Examples of such antonyms would be outdated, obsolete, unfashionable, outmoded, passe, antiquated, archaic, and prehistoric. These words all connote a lack of modernity, relevance or style, and are the opposite of being in trend. Being aware of these antonyms can be useful, especially in the fashion and design industry, as it enables individuals to accurately contrast and compare trends and fashion styles.