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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211) Surely the people will not agree to a Rightist heading a ministry!
212) KJV He will surely reprove you, if ye do secretly accept persons.
213) Surely the output should be true and then false, since both Integer objects are the same.
214) A combination of these two theories will surely shed more light upon meaning construction of texts.
215) For such a large order, you will surely quote us closely.
216) Surely the United States Senate is big enough to take self - criticism and self - appraisal.