bored的動詞原形是什麼

例句：

There were several young people sitting around looking bored.

有幾個年青人閒坐着，一副無聊的樣子。

The drill is strong enough to bore through solid rock.

這把鑽足以鑽透堅固的巖石。

The title of the essay bore little relation to the contents.

這篇文章的'題目與內容很不相符。

There was a bored expression on her face.

她臉上有一種厭倦的表情。