also: きっかい
na-adjective, noun
strange; weird; mysterious; outrageous
Describes something bizarre, inexplicable, or suspicious; often carries a negative or unsettling tone. The reading きっかい is more emphatic and colloquial.
彼の行動は奇怪で、誰も理解できなかった。
His behavior was strange, and no one could understand it.
その事件には奇怪な点が多すぎる。
There are too many mysterious points in that case.