ECTOMORPH Antonyms There are 2 antonyms of the word ectomorph. (opposite meanings)Did you mean?Definition of ECTOMORPHSynonyms of ECTOMORPHAlso try opposite words for..ectomorphsectomorphicBest Opposite Words For ECTOMORPHTop 20Top 10 Top 20 (Default)Top 50 Top 100 All All (Default)WordsPhrases All All (Default)Verb Noun Adjective Adverb Expand?WordSave?Synonyms..UsageTypeendomorphnounnnoun • a heavy person with a soft and rounded bodymesomorphnounnnoun • a person with a well-developed muscular body