serious
seriousadjective
UK/ˈsɪəriəs/US/ˈsɪriəs/
BAD
A2very bad, or able to cause harm
- He was in a serious accident.
- Pollution is a serious problem.
NOT JOKING
B1meaning what you say, not joking
- Are you serious about leaving your job?
- I'm being serious!
QUIET
B1quiet and thinking carefully, not laughing
- She's a very serious child.
- Why do you look so serious?