Word parts purpose + -ly Pronunciation (US) IPA (key): /ˈpɝpəsli/ (UK) IPA (key): /ˈpɜːpəsli/ Audio (US)(file) Hyphenation: pur‧pose‧ly Adverb Positive purposely Comparative more purposely Superlative most purposely If you do something purposely, you do it on purpose. Antonym: accidentally Wikiwand - on Seamless Wikipedia browsing. On steroids.