# underweight

/ˈəndɝˌweɪt/ (US) · /ˌʌndəwˈeɪt/ (UK) · CEFR B2 · Adjective

Source: https://englishreference.com/word/underweight
Updated: 2026-05-20

## Definition

having a weight that is lower than what is considered normal or healthy for your height. You might use this to describe a person or an animal that is too thin.

For teachers: having a weight below the standard or healthy level for a given height or age. Often used in medical contexts to describe nutritional status or in general conversation to describe physical appearance.

## Examples

- The doctor told him he was underweight and needed to eat more.
- The vet noted that the puppy was slightly underweight for its age and recommended a high-protein diet.
- While the athlete's muscle mass was impressive, his overall body weight was considered underweight for his height, raising concerns about his long-term energy levels and recovery.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.