"No kidding!" (4)
(Other definitions for itis that I've seen before include "Suffix denoting inflammation" , "Suffix signifying inflammation" .)
(Other definitions for really that I've seen before include "Actually, truly" , "In genuine way" , "Indeed" , "Go on" , "without a doubt" .)
(Another definition for duh that I've seen is " How slow".)
'no kidding?' is the definition.
(I've seen this in another clue)
This is all the clue.
'no kidding' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for truly that I've seen before include "Indeed" , "Genuinely, properly" , "Really, genuinely" , "with accuracy" , "Verily" .)