Educado vs. instruído vs. culto vs. erudito vs. douto
While English often groups concepts of learning and manners under educated, Portuguese distinguishes clearly between having good manners (educado), having formal schooling (instruído), possessing refined culture (culto), having deep academic knowledge (erudito), and commanding authoritative wisdom (douto).
Educado
A2This is the most common false friend for English speakers. While it can mean schooled, it primarily refers to someone who is polite, well-mannered, and has a good upbringing regarding social etiquette.
O menino foi muito educado e cedeu o lugar à idosa.
(The boy was very polite and gave up his seat to the elderly woman.)
Seria educado da sua parte agradecer pelo presente.
(It would be polite of you to say thank you for the gift.)
Eles são vizinhos silenciosos e muito educados.
(They are quiet and very well-mannered neighbors.)
Instruído
B2This refers to someone who has received formal instruction, schooling, or technical training. It implies the person is informed and knowledgeable, but not necessarily sophisticated or highly cultured.
Ele é um homem instruído que conhece bem as leis do país.
(He is an educated man who knows the country's laws well.)
Precisamos de um técnico instruído para operar esta máquina.
(We need a trained technician to operate this machine.)
A leitura torna o cidadão mais instruído e consciente.
(Reading makes a citizen more informed and aware.)
Culto
B2This describes a person who is cultured. It goes beyond school grades to imply a broad general knowledge, intellectual sophistication, and an appreciation for arts, literature, and history.
Ela é uma mulher muito culta que adora ópera e literatura clássica.
(She is a very cultured woman who loves opera and classical literature.)
A conversa com ele foi fascinante, pois ele é extremamente culto.
(The conversation with him was fascinating, as he is extremely cultured.)
Para parecer mais culto, ele começou a aprender francês.
(To seem more cultured, he started learning French.)
Erudito
C1This indicates a high level of scholarly knowledge. An erudito person is an expert who has studied a subject deeply and academically. It is a step above culto in terms of academic rigor.
O professor escreveu uma análise erudita sobre a poesia medieval.
(The professor wrote a scholarly analysis on medieval poetry.)
Ele não é apenas inteligente, é um erudito em física quântica.
(He isn't just smart, he is a scholar in quantum physics.)
O vocabulário dele é tão erudito que às vezes é difícil de entender.
(His vocabulary is so scholarly that it is sometimes hard to understand.)
Douto
C2This is a formal, often archaic or literary term for someone very learned or wise. It is rarely used in casual conversation and is mostly found in legal contexts or stiff, formal writing.
Os doutos juízes chegaram a uma conclusão complexa.
(The learned judges arrived at a complex conclusion.)
Ele consultou os livros dos sábios e doutos do passado.
(He consulted the books of the wise and learned men of the past.)
A plateia ouviu atentamente o douto discurso do reitor.
(The audience listened attentively to the dean's learned speech.)
Summary
To summarize: use educado for good manners/politeness; instruído for formal schooling/information; culto for sophistication/refined tastes; erudito for deep academic expertise; and douto only in very formal or legal contexts to mean wise/learned.