'Adeus' is a Portuguese word for 'goodbye' or 'farewell' used to express the act of departing or ending a conversation or meeting. In the Portuguese language, there are different synonyms for the word 'adeus' depending on the context and the degree of formality. Some common synonyms for 'adeus' include 'tchau,' which is a casual way of saying goodbye, 'ate logo,' which means 'see you later' when you plan to see someone again, 'ate breve' which also means 'see you soon,' and 'despedida,' which refers to the act of saying goodbye. Other formal or less commonly used synonyms for 'adeus' include 'adeusinho,' 'adios,' and 'sayonara.''.