Synonym: earnest, engrossed, grave, important, momentous, pensive, profound, reflective, sincere, solemn, thoughtful, weighty, zealous. Antonym: frivolous. Similar words: imperious, mysterious, curious, various, furious, notorious, nefarious, glorious. Meaning: ['sɪrɪəs /'sɪər-] 
adj. 1. concerned with work or important matters rather than play or trivialities 2. of great consequence 3. causing fear or anxiety by threatening great harm 4. appealing to the mind 5. completely lacking in playfulness 6. requiring effort or concentration; complex and not easy to answer or solve.
adj. 1. concerned with work or important matters rather than play or trivialities 2. of great consequence 3. causing fear or anxiety by threatening great harm 4. appealing to the mind 5. completely lacking in playfulness 6. requiring effort or concentration; complex and not easy to answer or solve. 
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121. You escaped serious injury by a whisker, so consider yourselves very lucky.
122. The recent outbreaks of cholera are a timely reminder that this disease is still a serious health hazard.
123. The agreement removes the last serious obstacle to the signing of the arms treaty.
124. He was supposed to be a serious performer, but the crowd laughed him off the stage.
125. I feel the remark was inappropriate for such a serious issue.
126. Her involvement in the fraud has left a serious blot on her character.
127. His clothes were rather flamboyant for such a serious occasion.
128. Their boycott of the talks constitutes a serious impediment to peace negotiations.
129. His books are enormously easy to read, yet he is a serious artist.
130. A pedigree pup should have been inoculated against serious diseases before it's sold.
131. He is working in tandem with officials of the Serious Fraud Office.
132. Millions more suffer from serious sleep deprivation caused by long work hours.
133. All at once, Mick's serious expression softened into a grin.
134. His failure to appear raises serious doubts as to his reliability.
135. He sustained serious neck injuries after he broke someone's fall.
136. He was a deeply serious musician who had shown his brilliance very early.
137. The Church of England put a serious obstacle in the path of women who want to become priests.
138. He's too serious and dedicated, wrapped up in his career.
139. Outside of my home, I look like a very obedient, very serious, very good kind of girl, but nobody knows what happens inside the house. Malala Yousafzai 
140. Money has been the most serious handicap that we have ever met. There are times when poverty is fortunate. Clarence Darrow
141. Politics is too serious a matter to be left to the politicians. Charles de Gaulle
142. If you are truly serious abut preparing your child for the future, don't teach him to subtract teach him to deduct. Fran Lebowitz
143. I have come to the conclusion that politics are too serious a matter to be left to the politicians. Charles de Gaulle
144. Life does not cease to be funny when people die any more than it ceases to be serious when people laugh. George Bernard Shaw
145. There was a serious slump in the 1930 s.
146. The unlawful possession of drugs is a serious crime.
147. Uncontrolled it is a serious source of air pollution.
148. Supplementary budget just to avoid more serious economic deterioration.
149. The immediate consequence with wasteful resource is pollution serious.
150. He started earning serious money only in the sixties.
More similar words: imperious, mysterious, curious, various, furious, notorious, nefarious, glorious, delirious, penurious, gregarious, notoriously, precarious, lugubrious, laboriously, glorious revolution, period, series, superior, inferior, ulterior, interior, exterior, a series of, deteriorate, riotous, pious, odious, perilous, envious.