Relatively light

• Too thin?

WordNet Word definitions in WordNet
adj. having unattractive thinness; "a child with skinny freckled legs"; "a long scrawny neck" [syn: scraggy , scrawny , skinny , weedy ]

Wikipedia Word definitions in Wikipedia
Underweight is a term describing a person whose body weight is considered too low to be healthy. The definition usually refers to people with a body mass index (BMI) of under 18.5 or a weight 15% to 20% below that normal for their age and height group.

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1899, from under - + weight .

Longman Dictionary of Contemporary English Word definitions in Longman Dictionary of Contemporary English
adjective EXAMPLES FROM OTHER ENTRIES ▪ a premature, underweight baby ▪ The doctor says that I'm underweight and has put me on a special diet. ▪ Women who consume large amounts of caffeine are more likely to give birth to underweight babies. EXAMPLES FROM ...

Wiktionary Word definitions in Wiktionary
1 Of an inappropriately or unusually low weight. 2 Not too heavy for an intended purpose. 3 (context finance English) Being less invested in a particular area than market wisdom suggests. n. The state or quality of being #Adjective. v 1 (context transitive ...