The Oxford Thesaurus An A-Z Dictionary of Synonyms - surelyadv.

1) certainly, to be sure, positively, absolutely, definitely, undoubtedly, indubitably, unquestionably, beyond the shadow of a doubt, beyond question, doubtless, doubtlessly, assuredly, Colloq sure, US absotively-posolutely: He is surely one of the finest riders I've ever seen. 2) firmly, solidly, confidently, unfalteringly, steadily, unswervingly, unhesitatingly, determinedly, doggedly, securely: Slowly but surely, the Great Bamboni stepped out onto the tightrope stretched across the Reichenbach Falls.