I just can't say how gifted he is. I can't say enough about how gifted he is. [ Both of these sound more natural to me.
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AnonymousDoes the first one mean you don't know how gifted he is and the second one that he is very gifted?I'm trying to say that he is very gifted not that I don't know how gifted he is.You're trying to say two different things. I think that perhaps you want I had no idea how gifted he is.