noun un·der·weight \ˌən-dər-ˈwāt\

Definition of UNDERWEIGHT

:  weight below normal, average, or requisite weight

First Known Use of UNDERWEIGHT



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: weighing less than the normal or expected amount : too light

Full Definition of UNDERWEIGHT

:  weighing less than the normal or requisite amount


  1. <the long illness left him frail and underweight>

First Known Use of UNDERWEIGHT

UNDERWEIGHT Defined for Kids


adjective un·der·weight \ˌən-dər-ˈwāt\

Definition of UNDERWEIGHT for Kids

:  weighing less than what is normal, average, or necessary
Medical Dictionary


adjective un·der·weight \-ˈwāt\

Medical Definition of UNDERWEIGHT

:  weighing less than the normal amount for one's age, height, and build <underweight children> <underweight adults typically have a body mass index of less than 18.5>


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