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As in, to add a selfish and careless tinge to 決める? Here, for instance:

> 「ふうん。勝手に決めて、わたしに負けるのもイヤ？」

Implying that such action (without taking any other context into
consideration) would lead the other party to lose to the speaker?

Thank you.
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2015-02-18T00:19:38.353
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2015-02-19T04:43:27.020
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question
meaning
Can 勝手に決める by itself carry a negative connotation?
Depending on the situation yes, it can carry a negative connotation. It is
especially easy to see this situation in school and love-related dramas where
people are trying to make plans and there is a quarrel or disagreement over
something and one of the parties gives up trying to give input.

> Aさん： じゃあ、どうする？  
>  Bさん： そうだね．．．  
>  Aさん： どこのレストラン行く？イタリアン？フレンチ？  
>  Bさん： ちょっと洋食は今食べる気じゃないなぁ～  
>  Aさん： じゃあ、中華料理は？  
>  Bさん： それも別に食べる気分じゃないな～  
>  Aさん： もういいよ、 **勝手に決めて** <--- Is now angry/fed up
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2015-02-19T00:21:31.313
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2015-02-19T04:43:27.020
2015-02-19T04:43:27.020
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answer