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# What is the opposite of “gibbous”?

## What is the antonym of “gibbous”?

The antonyms of gibbous are concave and sunken. The antonyms concave and sunken describe a surface that is curved inward or depressed, unlike gibbous, which describes a surface that is curved outward.

## Brief Definitions of the Antonym(s)

Learn when and how to use these words with these examples!

concave

Having a surface that curves inward like the interior of a circle or sphere.

Example

The inside of the bowl was concave, making it perfect for holding soup.

sunken

Having a surface that is lower than the surrounding area; depressed.

Example

The old shipwreck lay sunken at the bottom of the ocean.

## How are these antonyms different from each other?

• 1Concave describes a surface that curves inward like the interior of a circle or sphere.
• 2Sunken describes a surface that is lower than the surrounding area and can be used to describe a depression in the ground or a hollow in an object.

## Good things to know

• 1Geometry: Use concave to describe shapes that curve inward, such as the interior of a circle or sphere.
• 2Descriptive Writing: Use sunken to describe a depression in the ground or a hollow in an object.
• 3Astronomy: Use gibbous to describe the shape of the moon when it is more than half but less than fully illuminated.
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Remember this!

The antonyms of gibbous are concave and sunken. Concave describes a surface that curves inward, while sunken describes a surface that is lower than the surrounding area. Use these words in geometry, descriptive writing, and astronomy to convey specific shapes and features.

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