https://www.merriam-webster.com/thesaurus/ectomorphic
ECTOMORPHIC Synonyms: 70 Similar and Opposite Words | Merriam-Webster Thesaurus
Synonyms for ECTOMORPHIC: willowy, lanky, spindly, weedy, svelte, rangy, stringy, reedy; Antonyms of ECTOMORPHIC: obese, overweight, chubby, fat, pudgy,...
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