Fantasque is a French word that translates to "whimsical," "fanciful," or "capricious." There are many synonyms for this word that can help to diversify and enrich your vocabulary. Some alternative words that can be used in place of fantasque include quirky, unconventional, peculiar, eccentric, idiosyncratic, unpredictable, and unusual. These words all suggest an element of playfulness, creativity, and unpredictability. Using these synonyms can add depth and nuance to your writing or speaking and can help to convey a more accurate and interesting picture of the subject you are describing.