underweight vs scraggy

underweight and scraggy both are adjectives.

Word	Noun	Adjective	Verb	Adverb
underweight	No	Yes	No	No
scraggy	No	Yes	No	No

As adjectives, underweight and scraggy are synonyms defined as:

Other synonyms of underweight include boney, bony, scraggly, scrawny, skinny, weedy.

underweight (adjective)	scraggy (adjective)
being very thin	being very thin
	having a sharply uneven surface or outline