Dictionary
se•ri•ous
Pronunciation: (sēr'ē-us), [key]—
adj.
1. of, showing, or characterized by deep thought.
2. of grave or somber disposition, character, or manner:
a serious occasion; a serious man.
3. being in earnest; sincere; not trifling:
His interest was serious.
4. requiring thought, concentration, or application:
serious reading; a serious task.
5. weighty or important:
a serious book; Marriage is a serious matter.
6. giving cause for apprehension; critical:
The plan has one serious flaw.
7. Med.(of a patient's condition) having unstable or otherwise abnormal vital signs and other unfavorable indicators, as loss of appetite and poor mobility: patient is acutely ill.
—
n.
that which is of importance, grave, critical, or somber:
You have to learn to separate the serious from the frivolous. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.