Forastero is a Spanish word that means outsider or foreigner. It can also refer to someone who is not familiar with a particular location or someone who is new to an area. There are several synonyms for the word forastero, including extranjero, which also means foreigner; foráneo, which means alien or stranger; ajeno, which means someone who is not part of a particular group; and desconocido, which means unknown or unfamiliar. When looking for a replacement for the word forastero, it is important to consider the context in which the word is being used to choose the most appropriate synonym.