What does "underweight" mean?

The state or quality of being underweight.

What is a synonym for "underweight"?

Common synonyms include: wasted, avoirdupois, bantamweight, beef, beefiness, boney.

adj, noun, verb

adj, noun, verb ·3 syllables ·Moderate ·College level

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."