Roundish; having a slightly small, rounded, or plump appearance (colloquial).
丸っこいクッションがソファに並んでいる。
Roundish cushions are lined up on the sofa.
彼女は丸っこい顔立ちで、笑うと印象が柔らかい。
She has a roundish face, and when she smiles her impression is gentle.
丸っこいボタンは押しやすい。
Round buttons are easy to press.