What does "underweight" mean?
The state or quality of being underweight.
Underweight
adj, noun, verb
adj, noun, verb ·3 syllables ·Moderate ·High school level
Meaning at a glance
- Primary sense: The state or quality of being underweight.
- Grammar: underweight is listed as adj, noun, verb.
- Nearest alternatives: anorexic, avoirdupois, bantamweight, beef.
- Useful contrasts: overweight, fat reserves, healthy weight.
- Usage evidence: BMI categories (underweight, overweight or obese) from general reading table are inappropriate for athletes, children, the elderly, and the infirm.
How to use "underweight"
- Start with the primary definition, then check the part of speech before placing the word in a sentence.
- Compare nearby synonyms to make sure "underweight" carries the exact meaning, tone, and strength you need.
- Use the example sentence as a context check. If your sentence uses the word differently, confirm that the grammar still fits.
Meaning check
- Does the word fit the sentence's grammar?
- Does it match the intended tone rather than only the dictionary definition?
- Would a simpler synonym be clearer for the reader?
- Is there enough surrounding context to prevent ambiguity?
Source and review context
This entry combines structured lexical data with WordToolSet review checks. Definitions, examples, synonyms, and usage notes may come from different source tables, so the page is designed to show evidence from more than one angle before you rely on "underweight" in a final draft.
If a word has several senses, prefer the sense that matches your sentence's grammar and surrounding context. A correct definition can still be the wrong choice when the sentence needs a different register, emphasis, or level of specificity.
Before you rely on this definition
Read the first definition as a starting point, then check the example, synonyms, and part of speech before treating "underweight" as the right word for your sentence.
If your draft is formal, technical, persuasive, or sensitive, compare "underweight" with a nearby alternative so the final choice matches both meaning and reader expectation.
Compare nearby meanings
- Use synonyms when you need a softer, stronger, simpler, or more specific word.
- Use antonyms to check the boundary of the meaning and avoid accidental contrast.
- Use the example sentence to confirm the word behaves naturally in context.
- Keep the original wording when a replacement adds complexity without improving precision.
Definition decision workflow
1. Identify the role
Check whether "underweight" is acting as adj, noun, verb in your sentence. A definition is only useful when the grammar matches the way the word is being used.
2. Test the nearest option
Compare it with "anorexic" and other nearby choices to see whether the sentence needs a softer, stronger, or more familiar word.
3. Confirm with context
Use the example sentence below as an evidence check, then read your own sentence out loud to catch tone or rhythm problems.
Review note: Definition pages are checked for source coverage, sentence evidence, synonym support, and editorial insight before they are treated as approval-ready pages. If the evidence is too thin, the page remains available to users but is kept out of the approval-facing indexed inventory.
Final meaning check
Before publishing a sentence with "underweight", ask whether the word helps the reader understand the idea faster. A precise word should reduce confusion, not simply make the sentence look more polished.
When the definition, synonym evidence, and example context point in the same direction, the word is usually a safer choice. When they conflict, revise the sentence or choose a clearer alternative.
Definitions
Noun
- 1 The state or quality of being underweight. uncountable
"1996, United States Institute of Medicine Committee on Scientific Evaluation of WIC Nutrition Risk Criteria, WIC Nutrition Risk Criteria: A Scientific Assessment, National Academies Press, →ISBN, page 110, Underweight reflects the body’s thinness, but the term does not necessarily imply the nature and causes of underweight."
- 2 An underweight person. countable
- 3 An underweight investment. countable
"Further, structured managers usually attempt to hit their lower targets by relying on a relatively large number of small active deviations (i.e., overweights and underweights)."
Verb
- 1 To underestimate the weight of. transitive
- 2 To give insufficient weight to (a consideration); to underestimate the importance of. transitive
- 3 To invest in less than conventional wisdom would dictate. transitive
"Although the portfolio overweights the German market, it underweights German marks."
Adjective
- 1 Of an inappropriately or unusually low weight.
"He's so underweight he's had to buy smaller clothes."
- 2 Not too heavy for an intended purpose.
"The suitcase is just slightly underweight; I'll let it on the plane."
- 3 Being less invested in a particular area than market wisdom suggests.
"The fund is underweight in mining."
Adjective
- 1 being very thin wordnet
Antonyms
Example
"BMI categories (underweight, overweight or obese) from general reading table are inappropriate for athletes, children, the elderly, and the infirm."
Common questions
What is a synonym for "underweight"?
Common synonyms include: anorexic, avoirdupois, bantamweight, beef, beefiness, boney.
How do you use "underweight" in a sentence?
BMI categories (underweight, overweight or obese) from general reading table are inappropriate for athletes, children, the elderly, and the infirm.
Etymology
From under- + weight.