Source : Webster's Revised Unabridged Dictionary (1913)

Remarkable \Re*mark"a*ble\ (-?-b'l), a. [F. remarquable.]
   Worthy of being remarked or noticed; noticeable; conspicuous;
   hence, uncommon; extraordinary.

         'T is remarkable, that they Talk most who have the
         least to say.                            --Prior.

         There is nothing left remarlable Beneath the visiting
         moon.                                    --Shak.

   Syn: Observable; noticeable; extraordinary; unusual; rare;
        strange; wonderful; notable; eminent. --
        {Re*mark"a*ble*ness}, n. -- {Re*mark"a*bly}, adv.

Source : WordNet®

remarkable
     adj 1: unusual or striking; "a remarkable sight"; "such poise is
            singular in one so young" [syn: {singular}]
     2: worthy of notice; "a noteworthy fact is that her students
        rarely complain"; "a remarkable achievement" [syn: {noteworthy}]