Adjectives

(s)scraggy, scraggly, boney, bony, scrawny, skinny, underweight, weedybeing very thin“a child with skinny freckled legs”, “a long scrawny neck”, “pale bony hands”
(s)jagged, jaggy, scraggyhaving a sharply uneven surface or outline“the jagged outline of the crags”, “scraggy cliffs”