weedy
wee-dy
adjective
Having a thin, weak, or frail physique; lacking physical strength.
"He was a weedy lad, not very athletic."
adjective
Overgrown with unwanted wild plants, appearing neglected and untidy.
"The allotment became weedy quickly."
Thesaurus
Synonyms: underweight, lean, scraggly, scraggy, boney, bony, skinny, scrawny, thin
Antonyms: weedless