Antonym: perhaps. Similar words: leisurely, purely, obscurely, rely, barely, rarely, merely, rely on. Meaning: ['ʃʊrlɪ /'ʃʊə-] 
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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1) You surely don't begrudge him his happiness.
2) Surely we should do something about it?
3) That incident will surely bring on a crisis.
4) Man who has a settled purpose will surely succeed.
5) You must have heard about the riots, surely?
6) The goat leaped surely from rock to rock.
7) The benefits would surely far outweigh the risks.
8) Surely such weighty matters merit a higher level of debate?
9) He will surely fail.
10) Surely anyone with marketing gumption should be able to sell good books at any time of year.
11) Surely you don't expect me to take your potty suggestions seriously?
12) It's surely only a matter of time before he is found, isn't it?
13) The company's donation was surely motivated by self-interest, as it attracted a lot of media attention.
14) It should surely be possible for them to reach an agreement.
15) You're an intelligent woman, surely you realize by now that I'm helping you.
16) Surely my existence cannot be so purposeless?
17) Overeating is surely the main cause of obesity.
18) Surely you don't expect me to believe that?
19) Surely you won't turn your back on them?
20) Surely we can rise above every difficulty.
21) He's running so well, surely he'll take the gold.
22) Their marriage was surely written in the stars.
23) He has refused to help? Surely not!
24) I suspectshe surely takes a fancy to you.
25) My dear fellow, surely you don't mean that!
26) Surely you can spare me a few minutes?
27) Paxman is surely the ultimate thinking woman's crumpet.
28) You can't still hold that against him,(http://sentencedict.com/surely.html) surely?
29) Surely I've met you before somewhere.
30) Wherever in the world a people knows desperate want, there must appear at least the spark of hope, the hope of progress--or there will surely rise at last the flames of conflict. 