bad
1 bad or dangerous:
a serious illness / problem / offence * to cause serious injury / damage * They pose a serious threat to security. * The consequences could be serious.
needing thought
2 needing to be thought about carefully; not only for pleasure:
a serious article * a serious newspaper * It's time to give serious consideration to this matter.
important
3 that must be treated as important:
We need to get down to the serious business of working out costs. * The team is a serious contender for the title this year.
not silly
4 thinking about things in a careful and sensible way; not silly:
Be serious for a moment; this is important. * I'm afraid I'm not a very serious person.
not joking
5 ~ (about sb/sth)
