Synonyms for Scrawny (same or very similar meaning)
WordNet sense 1 (inferior in size or quality):
scrubby, stuntedWordNet sense 2 (of low or inferior quality):
inferiorWordNet sense 3 (being very thin):
skinny, underweight, weedy, boney, scraggyWordNet sense 4 (lacking excess flesh):
lean, thinFrom the ODE community, based on WordNetadd/edit