Source : WordNet®

without doubt
     adv 1: used to reinforces an assertion; "it's expensive all right"
            [syn: {all right}, {alright}]
     2: admittedly; "to be sure, he is no Einstein" [syn: {to be
        sure}, {no doubt}]
     3: with certainty; "it's undoubtedly very beautiful" [syn: {undoubtedly},
         {doubtless}, {beyond question}, {beyond any doubt}]