丸い

1. Origins, structure, and basic meaning

• Structure: 丸い(まるい) is an i-adjective meaning round in shape.
• Basic usage: It describes the round outline of a table or the rounded shape of Earth.

2. Common pitfalls and similar expressions

• Roundness in two and three dimensions
  • 丸いテーブル can describe a circular outline, while 丸い球 describes a three-dimensional spherical shape.
• Conjugation
  • Use 丸い before a noun and 丸くない for the negative. 丸くする means making something round.