Synonym: definite, particular, positive, some, special, sure. Antonym: doubtful, uncertain. Similar words: for certain, certainly, uncertain, uncertainty, certainly not, entertainment, curtain, maintain. Meaning: ['sɜːtn] 
adj. 1. definite but not specified or identified 2. having or feeling no doubt or uncertainty; confident and assured 3. established beyond doubt or question; definitely known 4. certain to occur; destined or inevitable 5. established irrevocably 6. reliable in operation or effect 7. exercising or taking care great enough to bring assurance.
adj. 1. definite but not specified or identified 2. having or feeling no doubt or uncertainty; confident and assured 3. established beyond doubt or question; definitely known 4. certain to occur; destined or inevitable 5. established irrevocably 6. reliable in operation or effect 7. exercising or taking care great enough to bring assurance. 
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91. An imbalance in certain chemicals leads to disturbances in the brain's function.
92. Country folk can tell you that there are certain places which animals avoid.
93. The minister suggested that the dire prophecies of certain leading environmentalists were somewhat exaggerated.
94. I'm certain David's told you his business troubles. Anyway, it's no secret that he owes money.
95. They say he's certain to get a nomination for best supporting actor.
96. A certain ruler in the Middle Ages was famous for poisoning her guests with chemicals put into their drinks.
97. His executive position entitled him to certain courtesies rarely accorded others.
98. I'm absolutely certain that I left the keys in the kitchen.
99. We feel certain you will understand our position in this matter.
100. Political correctness is the principle of avoiding language or behaviour that may offend certain groups of people.
101. They are demanding certain guarantees before they sign the treaty.
102. Some soils are actually too alkaline for certain plant life.
103. Certain chemicals can induce undesirable changes in the nervous system.
104. Farmers are eligible for government support if they let a certain amount of land lie fallow.
105. He philosophized, he admitted, not because he was certain of establishing the truth[Sentence dictionary], but because it gave him pleasure.
106. Some doctors advise setting aside a certain hour each day for worry.
107. Reducing the number of staff is certain to inflame the already angry medical profession.
108. These chemicals can emanate certain poisonous gases.
109. The concrete will set after a certain time.
110. I was not certain I had heard aright.
111. The system allows currencies to fluctuate within certain limits.
112. Regulations prescribe certain standards for building materials.
113. He was quite certain about/of his attacker's identity.
114. I'm not certain who was there.
115. The library's only open at certain times of day.
116. Early man shows certain affinities with the ape.
117. The tragedy had a certain inevitability about it.
118. Nude sunbathing is only allowed on certain beaches.
119. The team looks almost certain to win the match.
120. They're sure/certain to be late.
More similar words: for certain, certainly, uncertain, uncertainty, certainly not, entertainment, curtain, maintain, concert, undertake, retain, obtain, contain, sustain, captain, container, retaining, sustainable, cancer, soccer, dancer, officer, concern, grocery, producer, ceremony, shortage, stair, mortality, important.