doubtless

adv.

[1]	undoubtedly , doubtlessly , undoubtedly , doubtlessly , no doubt , indubitably , indisputably , unquestionably , surely , for sure , certainly , for certain , naturally , without (a) doubt , beyond/without (a shadow of) a doubt , truly , positively , absolutely , (Colloq) absotively , posolutely , (US) make no mistake
[2]	probably , most/very likely , in all probability , supposedly , presumably