Pronunciation (US) IPA (key): /ˈmɑnstrəs/ (UK) IPA (key): /ˈmɒnstrəs/ Audio (UK)(file) Hyphenation: mon‧strous Adjective Positive monstrous Comparative more monstrous Superlative most monstrous If something is monstrous is very ugly or scary If something is monstrous is very bigWikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads