swiftly adverb Stress: first syllable 🤍 Save Syllables: swift-ly (2) English Definition At high speed; quickly Example Sentence The river flows swiftly down the mountain. US IPA /ˈswɪft.li/ 🔊 Listen US UK IPA /ˈswɪft.li/ 🔊 Listen UK Synonyms quickly rapidly speedily fast promptly Antonyms slowly sluggishly leisurely Share this Word Facebook WhatsApp X Telegram Copy Link