Word parts prompt + -ly Pronunciation (UK) IPA (key): /ˈprɑmptli/ (US) IPA (key): /ˈprɒmptli/ Audio (US)(file) Hyphenation: prompt‧ly Adverb Positive promptly Comparative more promptly Superlative most promptly If something is done promptly, it is done in soon and quickly. Wikiwand - on Seamless Wikipedia browsing. On steroids.