For foreigners studying Japanese in Kumamoto. Very surprisingly, this is not the standard language, apparently. I think I have always read it this way. Sorry 🙏.
If you want to call it hard, you have to call it Kibishii. You should read 厳か as Ogosoka not Kibishika. If you want to say strong you have to say it Tsuyoi. You should read 強か as Sitataka not Tsuyoka. If you want to say sweep you have to say Haku. You should read 掃く as Haku not Hawaku. Kibishika, Tsuyoka, Hawaku are not correct, these are dialect, not standard language. If you are in Kumamoto, you have probably heard of [Kibishika Tsuyoka Hawaku]. So interesting ! Atsuko(＞∀＜)‼︎