Similar words
serio
grave is more about severity, like a serious or grave illness; serio is more about demeanor, like a serious person who isn't joking.
Similar in other languages
Portuguese
grave
grave is the Portuguese word for the same thing — both mean "serious."
Portuguese
sério
sério is the Portuguese word for the same thing — both mean "serious."
Practice
1 What does grave mean?
serious
2 Fill the gap: Es un problema ___.
Full sentence: Es un problema grave. (It's a serious problem.)
3 Which fingerprint chart matches grave?
grave: neutral register, common frequency, general domain, neutral connotation.