Mergen is a Mongolian word that translates to "wise" or "intelligent" in English. Synonyms for this word might include "clever," "knowledgeable," "smart," and "perceptive." Additional synonyms for mergen might include "wise," "astute," "discerning," "insightful," "sagacious," "shrewd," and "witty." These words all connote a similar sense of intelligence and wisdom, but they each have slightly different connotations and nuances. Some synonyms for mergen might also include terms like "expert," "proficient," and "skilled," which emphasize a particular expertise or knowledge in a certain area. Overall, synonyms for mergen reflect qualities of wisdom, intelligence, and knowledgeability.