The word "marcid" means decaying or stale, and can be used to describe food, plants, or anything that has lost its freshness. Synonyms for "marcid" includes words such as "rotten," "spoiled," "putrid," "moldy," "fermented" and "foul." Other synonyms that can be used to describe something that is marcid include "off," "stale," "decayed," "discolored," and "corrupt." These words are often used to describe food or organic matter, but they can also be applied to ideas, beliefs, or creations that have lost their vitality or have been corrupted by time. By using synonyms for "marcid," one can add nuance and variety to their writing.