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underweight

[adjective uhn-der-weyt; noun uhn-der-weyt]
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adjective
  1. weighing less than is usual, required, or proper.
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noun
  1. deficiency in weight below a standard or requirement.
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Origin of underweight

First recorded in 1590–1600; under- + weight
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for underweight

Contemporary Examples

Historical Examples

  • They could as easily have charged you overweight as underweight.

    Uncle Sam Detective

    William Atherton Du Puy

  • The baby of a German housewife was underweight—that is, below normal.

    A Stake in the Land

    Peter Alexander Speek

  • They are the people who are overweight and the people who are underweight.

    Psychotherapy

    James J. Walsh

  • Blind abscesses at the roots will cause all sorts of aches and pains, as well as underweight.

    Diet and Health

    Lulu Hunt Peters

  • Underweight individuals sometimes have to train their digestive tracts for some of the foods they need.

    Diet and Health

    Lulu Hunt Peters


British Dictionary definitions for underweight

underweight

adjective
  1. weighing less than is average, expected, or healthy
  2. finance
    1. having a lower proportion of one's investments in a particular sector of the market than the size of that sector relative to the total market would suggest
    2. (of a fund etc) disproportionately invested in this waypension funds have become underweight of equities
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for underweight

adj.

1899, from under- + weight.

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Online Etymology Dictionary, © 2010 Douglas Harper

underweight in Medicine

underweight

(ŭndər-wāt′)
adj.
  1. Weighing less than is normal, healthy, or required.
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n.
  1. Insufficiency of weight.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.