underweight

[ adjective uhn-der-weyt; noun uhn-der-weyt ]
/ adjective ˈʌn dərˈweɪt; noun ˈʌn dərˌweɪt /

adjective

weighing less than is usual, required, or proper.

noun

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. 2020

Example sentences from the Web for underweight

British Dictionary definitions for underweight

underweight
/ (ˌʌndəˈweɪt) /

adjective

weighing less than is average, expected, or healthy
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
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

Medical definitions for underweight

underweight
[ ŭndər-wāt′ ]

adj.

Weighing less than is normal, healthy, or required.

n.

Insufficiency of weight.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.