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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61) The use of the word 'recumbent' is surely otiose after the word 'recline'.
62) I accept that the romance may have gone out of the marriage, but surely this is true of many couples.
63) Surely it is an economic nonsense to deplete the world of natural resources.
64) He made his way up the mountain slowly but surely.
65) It was surely overkill to screen three interviews on the same subject in one evening.
66) He is an artist, just as surely as Rembrandt or any other first-rate portrait painter is one.
67) If he'd reacted a fraction of a second later, he would surely have died.
68) Surely the function of the law is to protect everyone's rights.
69) Surely you're not going to give up? I thought you were made of sterner stuff .
70) The scandal surely signals the end of his political career.
71) Surely someone would stand up and let her sit down?
72) The board of directors must surely have been in Johnstone's pocket.
73) Surely they have a rightful claim on their father's land?
74) Thelatest trade figures will surely prick the bubble of governmentcomplacency about the economic situation.
75) It is surely the duty of the stronger members in a society to help those who are weak.
76) Surely 15 minutes is enough time for you to have a coffee.
77) They won't go,(sentencedict.com) surely?
78) It's surely overstepping the mark to behave so rudely to your guests.
79) Surely we can't just stand back and let this happen?
80) Surely no one would be mad enough to fly in this weather?
81) The pilot of the aircraft will surely be exculpated when all the facts are known.
82) You're surely not going to let a job/man like that slip through your fingers!
83) Surely you're not going out on a night like this?
84) We are slowly but surely gaining the support of the public.
85) All, right - minded ` people will be surely shocked by this outrage.
86) The meal was certainly too expensive and The meal was surely too expensive? .
87) What's that witches' brew you're concocting there - surely you don't expect me to drink it?
87) Sentencedict.com is a sentence dictionary, on which you can find excellent sentences for a large number of words.
88) Slowly but surely she started to fall in love with him.
89) The fault surely lies in the design of the equipment.
90) I don't understand your distinction: surely all painting is art?