クククmwahahaha (evil laughter)

漫画(まんが)を読(よ)みながらクククと笑(わら)う。

Laughing with a "mwahahaha" while reading a manga. {mwahahaha (evil laughter)}

弟(おとうと)が必死(ひっし)に声(こえ)を抑(おさ)えてクククと笑(わら)っている。

My younger brother is desperately trying to suppress his voice, chuckling with an 'mwahahaha'. {mwahahaha (evil laughter)}

電車(でんしゃ)の中(なか)なので、クククと小(ちい)さく笑(わら)うしかありません。

Since I'm in the train, all I can do is chuckle quietly, like "mwahahaha". {mwahahaha (evil laughter)}

授業(じゅぎょう)中(ちゅう)に急(きゅう)に全(すべ)てが可笑(おか)しく思(おも)えてきて、クククと笑(わら)ってしまった。

During class, everything suddenly seemed funny, and I couldn't help but burst into an evil laughter, 'mwahahaha'. {mwahahaha (evil laughter)}

クククと小(ちい)さく笑(わら)っていたのに、妻(つま)に笑(わら)っているのがバレてしまいました。

I was quietly chuckling to myself, but unfortunately, my wife discovered that I was laughing. {mwahahaha (evil laughter)}