lightweight

American  

[lahyt-wayt] / ˈlaɪtˌweɪt /

adjective

1. light in weight.

2. being lighter in weight, texture, etc., than another item or object of identical use, quality, or function: a lightweight alloy for ship construction.

   a lightweight topcoat;

   a lightweight alloy for ship construction.

3. without seriousness of purpose; trivial or trifling.

   lightweight reading.

4. of or relating to a lightweight.

   He's the new lightweight contender.

5. (of a horse, especially a hunter) able to carry up to 165 pounds (75 kilograms).

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noun

• lightweights
  plural

1. a person of less than average weight.

2. Informal. a person who is of little influence, importance, or effect.

3. a boxer or other contestant intermediate in weight between a featherweight, and a welterweight, especially a professional boxer weighing between 126 and 135 pounds (56.7–61 kilograms).

lightweight British  

/ ˈlaɪtˌweɪt /

adjective

1. of a relatively light weight

2. not serious; trivial

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noun

1. a person or animal of a relatively light weight

2. 1. a professional boxer weighing 130–135 pounds (59–61 kg)

   2. an amateur boxer weighing 57–60 kg (126–132 pounds)

   3. ( as modifier )

      the lightweight contender

3. a wrestler in a similar weight category (usually 115–126 pounds (52–57 kg))

4. informal a person of little importance or influence

Other Word Forms

Derived Forms

• ultralightweight
  adjective

Inflected Forms

Nouns

• lightweights
  plural

Etymology

Origin of lightweight

First recorded in 1765–75; light ² + weight

Explanation

When an object is lightweight, it weighs much less than other similar objects. A person is a lightweight if they can't handle much — if you get full after a small meal, big eaters might refer to you as a lightweight. Break lightweight apart — light + weight — and you see its definition right there in its root words. Someone who is called a lightweight is either a professional boxer who weighs under 135 pounds or he's someone with little importance or ability. When a company is looking to make layoffs, it's the lightweight employees, or those who just aren't important to the business that often get axed first.

Example Sentences

See Examples For:

lightweight lightweights

That becomes especially challenging in applications such as space exploration, where equipment must be compact, lightweight, and reliable.

From Science Daily ● Oct. 9, 2026

At the test track at Mira, the all-British creation silently demonstrated how a lightweight sports car can go from an idea to a vehicle in less than two years, helped by regional expertise.

From BBC ● Oct. 9, 2026

For example, users can run MAI Code 1.1 Flash, Microsoft AI’s lightweight coding model, directly on the device.

From MarketWatch ● Oct. 7, 2026

Trautman began a crusade for more compact, lightweight reading material.

From The Wall Street Journal ● Oct. 6, 2026

We’d decided to paint one of her mom’s step stools as a distraction; Abby’s mom was so short, she carried around a lightweight collapsible stool to all major events.

From "Hope Springs" by Jaime Berry

The lightweights have been sparring from a distance since Tsarukyan was overlooked for the interim title shot, despite being ranked number one in the division.

From BBC ● Jan. 25, 2026

The audience might forget those things, but it will remember how silly the suits looked as they struggled to deal with perceived lightweights who had organized against them.

From Slate ● Sep. 15, 2023

Certainly, they won’t accept academic lightweights to fill out the conference membership, but what choice do they have?

From Seattle Times ● Jul. 29, 2023

The two lightweights aren’t even fighting for a title or a fringe belt — making it a true grudge match.

From Washington Times ● Apr. 20, 2023

"We're lightweights," Mabel tried to joke, but her voice was thick with regret.

From "We Are Okay" by Nina LaCour