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WordReference Random House Learner's Dictionary of American English © 2024un•der•weight /ˈʌndɚˈweɪt/USA pronunciation adj. - weighing less than is usual or proper:dangerously underweight.[after a noun of measurement]The baby seems to be several pounds underweight.
WordReference Random House Unabridged Dictionary of American English © 2024un•der•weight (adj. un′dər wāt′;n. un′dər wāt′),USA pronunciation adj. - weighing less than is usual, required, or proper.
n. - deficiency in weight below a standard or requirement.
- under- + weight 1590–1600
Collins Concise English Dictionary © HarperCollins Publishers:: underweight /ˌʌndəˈweɪt/ adj - weighing less than is average, expected, or healthy
- 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
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