serious

US /ˈsɪr.i.əs/
UK /ˈsɪr.i.əs/
"serious" picture
1.

demanding or needing careful consideration or application

:
•
This is a serious matter that requires our full attention.
•
He made a serious effort to improve his grades.
:
gravesolemnearnestthoughtfulimportant
2.

not joking or fooling around; earnest in manner or intention

:
•
He looked at me with a serious expression.
•
Are you serious about quitting your job?
:
earnestsolemngravethoughtfulsincerehumorlessunsmilingpensiveintensedeep
3.

having important or dangerous possible results

:
•
The doctor said it was a serious illness.
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The accident caused serious damage to the car.
:
criticalseveregravedangerousalarming