Learn how to use the comparative “thinner” and superlative “thinnest” with example sentences and differences.

What is the comparative form of “underweight”?

The comparative form of “underweight” is “thinner”.

Example

She is thinner than her sister.

Example

He became thinner after starting a new diet.

What is the superlative form of “underweight”?

The superlative form of “underweight” is “thinnest”.

Example

Among all the contestants, she is the thinnest.

Example

The marathon runner has the thinnest body composition.

Why is this expression not used with most, more?

"Thinnest" and "thinner" are used with "underweight" to form the superlative and comparative. The forms "thinnest" and "thinner" are commonly used to indicate a higher degree of thinness or lack of body weight.

Does this expression have an irregular comparative/superlative form?

"Underweight" does not have an irregular comparative or superlative form. It follows the pattern of using "thinner" and "thinnest" for forming comparatives and superlatives.

Expressions with similar meanings to “thinner”

skinnier

Used to describe someone who is thinner or has less body fat.

Example

The model is skinnier than she appears in the photos.

slimmer

Used to indicate that someone has a more slender or lean physique.

Example

After exercising regularly, he became slimmer and more toned.

Expressions with similar meanings to “thinnest”

skinniest

Used to describe someone who has the least amount of body fat or is extremely thin.

Example

The fashion industry often promotes unrealistic standards of beauty, favoring skinniest models.

slimmest

Used to indicate that someone has the most slender or lean physique.

Example

She maintains a healthy lifestyle and has the slimmest figure among her friends.

Using than with comparative “thinner”

When using the comparative form "thinner" to compare two people, you would use "than" to connect the two parts of the comparison: Example: "She is thinner than her sister." Here, "than" is used to show that the level of thinness in "she" is higher than the level of thinness in "her sister."

How can I use this expression in context?

“thinner” and “thinnest” can be used in a variety of situations to compare speed.

• 1. Physical Appearance

  After losing weight, she became thinner than before.

  After losing weight, she became thinner than before.

• 2. Health

  The doctor advised him to gain weight as he was the thinnest person in the room.

  The doctor advised him to gain weight as he was the thinnest person in the room.

• 3. Fitness

  The athlete has the thinnest body composition among his teammates.

  The athlete has the thinnest body composition among his teammates.

• 4. Fashion

  The dress is designed for thinner individuals.

  The dress is designed for thinner individuals.

Related idioms and phrases

Skin and bones

Used to describe someone who is extremely thin or emaciated.

Example

After being sick for weeks, he looked like skin and bones.

Paper-thin

Used to describe something that is extremely thin or delicate.

Example

The pages of the book were paper-thin.