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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61. A serious split in the ruling coalition appeared soon after the election.
62. It was felt inappropriate by some that such a serious occasion should include dancing.
63. Not making a will can have serious consequences for the people you might wish to benefit.
64. This is a serious dispute, and could lead to armed conflict.
65. We will never countenance violence, however serious the threat against us.
66. The casual newspaper reader wouldn't like long articles on serious subjects every day.
67. Their demands could lead to a serious confrontation with management.
68. The court's initial verdict in the police officers' trial set off serious riots.
69. They went into town to indulge in some serious shopping.
70. Using a seatbelt will reduce the likelihood of serious injury in a car accident.
71. Although I soon convinced him of my innocence, I think he still has serious doubts about my sanity.
72. They spotted a niche in the market, with no serious competition.
73. We have learnt how to condense serious messages into short, self-contained sentences.
74. The riots are the most serious expression of anti-government feeling yet.
75. Her face was serious as she told us the bad news.
76. Destruction of the environment is one of the most serious challenges we face.
77. There is a serious message at the core of all this frivolity.
78. It's easy to be flippant(sentencedict.com), but we have a serious problem to deal with here.
79. The boy's condition has been downgraded from critical to serious.
80. They encountered serious problems when two members of the expedition were injured.
81. He is a serious artist, and totally committed to his work.
82. The proposals that you have put forward deserve serious consideration.
83. Fracture of any part of the body can be very serious in old people.http://Sentencedict.com
84. Growing levels of pollution represent a serious health hazard to the local population.
85. From his youth Nobel had taken a serious interest in literature and philosophy.
86. The heavy rain has led to serious flooding in some areas.
87. He was clearly intent on inflicting serious harm on someone.
88. At speeds above 50mph, serious injuries dramatically increase.
89. It causes blindness or serious loss of vision.
90. It was a question which deserved serious consideration.
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.