Translation guide
Describes a surface or shape that curves inward, like the inside of a bowl.
Describing a physical surface that curves inward
The standard technical term for a concave surface, used in geometry, optics, and general descriptions.
このレンズは凹面になっている。
This lens has a concave surface.
Describes a concave shape or form, often used in technical or descriptive contexts.
その地形は凹状をしている。
The terrain has a concave shape.
Everyday verb meaning 'is dented' or 'is sunken', commonly used for concave surfaces in daily life.
スプーンの内側はくぼんでいる。
The inside of a spoon is concave.
Casual verb meaning 'is dented' or 'is caved in', often for accidental or irregular concavity.
ボールが当たって車のドアがへこんでいる。
The car door is concave where the ball hit it.
Describing a concave polygon or function
Technical term for a concave polygon, used in geometry.
この図形は凹多角形です。
This shape is a concave polygon.
Mathematical term for a concave function.
この関数は凹関数である。
This function is concave.