Meaning of なっちゃねぇ


Context: a boy tells to a trainer that he wants to become a boxer, so the
trainer starts testing the boy's skills. After seeing that he's strong, the
trainer says "なっちゃねェな". I think it is a contraction of "なんてことはない", but even
so, I don't understand the meaning in this context. Thank you for your help!




It is actually a contraction of
[「なって（い）ない」](http://ejje.weblio.jp/content/%E3%81%AA%E3%81%A3%E3%81%A6%E3%81%AA%E3%81%84)
which means "to be no good". So in your situation, the trainer is saying that
the boy's boxing is no good. Note that is used to say "no good" as in "someone
is not good at something", and not that "someone himself is a good-for-
nothing".

On a side note, 「なんてことはない」 in the same speech pattern as the trainer would be
something like「なんてこっちゃねぇ」 or 「なんてこたぁねぇ」.

