Sus linguaes, a Latin phrase that means "under the tongues," is a term that refers to the secret and hidden things that people keep to themselves. This includes inner thoughts, hidden agendas, unspoken feelings, and other deep-seated emotions that people choose not to express verbally or in writing. Synonyms for sus linguaes include clandestine, concealed, confidential, covert, private, secret, and undisclosed. These terms refer to the hidden nature of information, thoughts, or feelings that individuals purposely keep away from others. Knowing these synonyms will help you to better understand and describe the concept of sus linguaes in written or spoken communication.