¿Cuál es la diferencia entre I'm careless. y I'm clumsy. y I'm a scatterbrain. ?Puedes dar oraciones como ejemplo.

Hi, Hiroyo san.
“Careless” is used when you weren’t paying enough attention to something. You could use it in a situation in which you could have avoided trouble if you’d been more careful. つまり、何かをする時、ちゃんと気をつけてすることです。
Don’t do your math homework carelessly. Take time and check your work.
“Clumsy” is physical. For example, if a person drops things often, you would say he is clumsy. This word has the nuance of being unskilled or uncoordinated. つまり、不器用です。
“Scatterbrained” is, well, my husband!! Scatter is 散らかす so it implies that your thoughts are all over the place so you can’t keep them straight.
My husband is so scatterbrained that he missed his dentist appointment...again.
Hope this helps!