Intentional
On Purpose, Deliberate
noun, の adjective
The circumstance was caused by the idea I had. Because I had this idea before the circumstance, it shows I was intentional in doing it. I did it on purpose.
Note that 故意 is mostly used in formal contexts.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
故意にしたつもりは全くないんです。
I didn't intentionally mean to do it at all.
故意ではありませんが、あなたを悲しませてしまったのは事実です。
It was not on purpose, but it did cause you grief.
ここでは、故意または過失によるものだったかが争点となります。
The disputed point here is whether it resulted from intentional or negligent conduct.
コウイチの秘密のベーコンを故意に食べた罪を認めます。
I plead guilty to intentionally eating Koichi’s secret bacon.