IPA: //ˈbreɪnˌsɪkli//
KK: /ˈbrānˌsiklē/
In a way that shows mental confusion or madness.
He spoke brainsickly, making it hard to understand his thoughts.
Brainsickly → It is formed from "brain" (from Old English "brægen", meaning the organ of thought) and "sickly" (from Old English "sicle", meaning sick or ill). The word describes a state of being mentally ill or disturbed, particularly in relation to one's thoughts or mind.
Think of 'brain' as the organ of thought and 'sickly' as being ill — together, they help you remember that 'brainsickly' refers to a disturbed or unhealthy state of mind.