Where does ～げ come from? For example in

> 地震の影響で工場を閉じることになったと説明する社長は **悔しげ** だった。

it is supposed to mean that we get a slight impression that the manager was
"regretful" while explaining why the factory had to stop.
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2015-07-02T13:20:54.147
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2015-07-02T15:23:53.043
2015-07-02T15:23:53.043
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question
grammar meaning etymology
Where does げ come from?