Impressive (4)
'impressive' is the definition.
(epic can mean grand or impressive)
This is all the clue.
(Other definitions for epic that I've seen before include "Large in scale" , "major work" , "Surpassing the ordinary" , "long poem telling of heroic deeds" , "(Of) immense (proportions)" .)
'impressive' is the definition.
(similar in meaning)
This is the entire clue.
(Other definitions for awesome that I've seen before include "Dreadful; amazing" , "Inspiring admiration - wonderful!" , "Hugely impressive, creating fear and wonder" , "Excellent (informal)" , "Totally cool!" .)
(Other definitions for wow that I've seen before include "Palindromic exclamation of surprise or admiration" , "Cor! - huge success" , "Expression of amazement" , "Exclamation of admiration - another palindrome" , "Impress hugely" .)
(Other definitions for ooh that I've seen before include "My goodness!" , "Exclamation of surprise or pain" , "Exclamation of delight" , "expression of delight" , "sound excited" .)