Synonyms (: Synonym of “esoteric” is:

The word "esoteric" describes something intended for or likely to be understood by only a small number of people with a specialized knowledge or interest. It implies a sense of exclusivity, reconditeness, or secrecy. Therefore, "Mysterious/Secret" is the correct synonym, as it accurately reflects the hidden or specialized nature of something esoteric.

• "Common" is incorrect because it means widely known or understood, which is the antonym of esoteric.
• "Public" is also incorrect, as it implies openness and accessibility to everyone, contrasting with the exclusive nature of esoteric knowledge.
• "Simple" is wrong because esoteric subjects are often complex and require deep understanding, not simplicity.