プログレッシブ和英中辞典(第4版)の解説
ひょんな
〔意外な〕unexpected;〔妙な〕strange
私たちはひょんなことから知り合った
We got acquainted by a strange chance [coincidence].
ひょんなことになった
It had an unexpected outcome./It had unexpected [strange] consequences.
彼とひょんな所で出会った
I met him where I had least expected to./It was the last place I (had) expected to meet him.