i-adjective
Colloquial and often affectionate term for a person, animal, or body part that is round and plump. Carries a cute or informal tone.
赤ちゃんの丸まっちい手がかわいい。
The baby's chubby hands are cute.
うちの猫は丸まっちくて、抱き心地がいい。
Our cat is plump and feels nice to hold.