Antonym: perhaps. Similar words: certainly not, certain, uncertain, for certain, uncertainty, entertainment, mainly, ungainly. Meaning: ['sɜːtnlɪ] 
adv. definitely or positively (`sure' is sometimes used informally for `surely').
adv. definitely or positively (`sure' is sometimes used informally for `surely'). 
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151. He will certainly die if you don't call a doctor.
152. A journey on one of the steam trains is certainly not to be missed!
153. Digging in the garden certainly takes it out of me these days.
154. He's not a fast horse but he's certainly a stayer.
155. I don't know the car's exact speed, but it was certainly travelling.
156. I can certainly answer for her professionalism, and whole-heartedly recommend her to any employer.
157. The couple idea is certainly oversold. There's so much pressure to become a couple that people feel failure if they don't conform.
158. To his surprise he didn't feel too weak. Light-headed certainly, and with a sense of unreality, but able to walk.
159. The dimensions of the market collapse were certainly not anticipated.
160. She may not have been the cleverest candidate but she was certainly the most enterprising.
161. It is a complex system, but it certainly makes a change.
162. The boat trip lasts three hours, so you certainly get your money's worth.
163. The prisoner has certainly justified his claims by his actions.
164. I certainly don't agree with his assertion that men are better drivers than women.
165. She's certainly gone up in my estimation since she told the boss what she thought of him.
166. She might be a little common at times, but she was certainly not boring.
167. I can certainly do the job if you give me time.
168. He certainly didn't pull any punches when it came to criticizing the work.
169. My audience certainly isn't the proverbial man in the street.
170. This was almost certainly the high-water mark of her career.
171. You may not like her, but she certainly has style .
172. This technique looks easy,[www.Sentencedict.com] but it most certainly is not.
173. The company certainly need some fresh blood with new ideas.
174. She can certainly hold her own against anybody in an argument.
175. Oh yes, I certainly did my time in the army .
176. Since he left his wife he's certainly gone down in my estimation .
177. It's a moderately entertaining film but it's certainly not a must-see.
178. Fleck was certainly not the only critic to do a hatchet job on his latest novel.
179. The principal was certainly a woman to be reckoned with.
180. She's certainly gained confidence over the last couple of years.
More similar words: certainly not, certain, uncertain, for certain, uncertainty, entertainment, mainly, ungainly, curtain, maintain, concert, undertake, obtain, retain, sustain, captain, contain, container, retaining, sustainable, in line, only, openly, if only, only too, fall in love, in line with, commonly, only that, cancer.