na-adjective
Describes a person or their behavior as lacking refinement, often in a physical or surface-level way; can refer to rough manners, sloppy appearance, or careless actions.
彼はがさつな手つきで箱を開けた。
He opened the box with rough, clumsy hands.
がさつな話し方をする人だ。
He's a person with a coarse way of speaking.
na-adjective
Focuses on interpersonal insensitivity: thoughtless remarks, lack of consideration, or boorish behavior that offends or annoys others.
がさつなことを言って彼女を怒らせた。
I said something tactless and made her angry.
あの人はがさつで、人の気持ちを考えない。
That person is rude and doesn't consider others' feelings.
Means 'careless' or 'sloppy' in handling things or speaking; overlaps with がさつ but can also imply negligence.
The origin is uncertain. It may be a sound-symbolic word (mimetic) suggesting roughness or coarseness, but the exact derivation is unclear.