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Concave vs. Convex 

antonyms
"Concave" vs. "Convex" in English

What Is Their Main Difference?

Both are adjectives that describe the shape of different items. However, 'concave' refers to objects whose middles are thinner than their edges, whereas, 'convex' refers to objects that have thicker middles.

Differences

'Concave' refers to objects with middles thinner than their edges, while, 'convex' refers to objects that have thicker middles. Below, there are examples of some concave and convex objects for you:

Example

Concave: hourglass, binoculars

Convex: football

Similarities

They both describe the shape of an object.

Are They Interchangeable?

These two can never be used interchangeably because they are antonyms.

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