Fully disable specific keyboard key

My laptop keyboard has been water damaged and the left control key occasionally activates.

I am aware of xmapmod -e “keycode 37=” to disable the left control key. I seek to do something else as this causes a new problem. When I hold down any other key, e.g. ‘a’, a will be repeatedly typed until left ctrl activates. Although left control doesn’t do anything now (thanks to xmapmod), it still interrupts key hold down.

I suppose that I need to stop the keyboard even listening for the left control key.

Does anyone have a fix for this? I am using linux mint. Thanks