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underweight

adjective
 
 
/ˌʌn.dəˈweɪt/ US  /-dɚ-/

Definition

Underweight people weigh too little and are too thin: According to the hospital chart he's four kilos underweight. → Opposite overweightThin or slender (of people)Not fit and healthyNarrow and thin
(Definition of underweight adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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