The word "rubicundly" refers to having a red or flushed complexion. Some synonyms for this word could include "rosy," "blushing," "flushed," "crimson," "ruddy," or "blooming." These words all describe a similar redness or pinkness in the skin, often as a result of increased blood flow. Depending on the context, other possible synonyms could include "vibrant," "glowing," or "radiant." It's important to choose synonyms carefully, based on the specific nuance and meaning of the original word, to ensure that the tone and feeling of the text remain accurate.