Similar words
grave
grave is more about severity, like a grave illness; sério is more about demeanor, like a serious person not joking.
Similar in other languages
German
ernst
ernst is the German word for the same thing — both mean "serious."
Spanish
grave
grave is the Spanish word for the same thing — both mean "serious."
Spanish
serio
serio is the Spanish word for the same thing — both mean "serious."
Practice
1 What does sério mean?
serious
2 Fill the gap: É um assunto ___.
Full sentence: É um assunto sério. (It's a serious matter.)
3 Which fingerprint chart matches sério?
sério: neutral register, core frequency, general domain, neutral connotation.