[ adjective uhn-der-weyt; noun uhn-der-weyt ]
See synonyms for underweight on Thesaurus.com
  1. weighing less than is usual, required, or proper.

  1. deficiency in weight below a standard or requirement.

Origin of underweight

First recorded in 1590–1600; under- + weight

Words Nearby underweight

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use underweight in a sentence

British Dictionary definitions for underweight


/ (ˌʌndəˈweɪt) /

  1. weighing less than is average, expected, or healthy

  2. finance

    • 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

    • (of a fund etc) disproportionately invested in this way: pension 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