Can someone please explain the meaning of the word "nante". I looked in jdict, but I don't really get the examples.
ガスをつけっぱなしにするなんて私も不注意でした。
It was careless of me to leave the gas on.
もう3マイルなんて歩けない。
Another three miles is more than I can walk.
人生なんて短い。
Life is very short.
君は鍵をなくすなんて不注意だったね。
It was careless of you to lose the key.
Thanks in advance.