underweight vs scraggly

underweight and scraggly both are adjectives.

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

As adjectives, underweight and scraggly are synonyms defined as:

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

underweight (adjective)	scraggly (adjective)
being very thin	being very thin
	ragged, thin, or untidy in appearance