un noun Stress: first syllable 🤍 Save Syllables: un (1) English Definition A prefix meaning 'not' or 'the opposite of'. Example Sentence The prefix 'un' is used to make words negative. US IPA /ʌn/ 🔊 Listen US UK IPA /ʌn/ 🔊 Listen UK Synonyms non- in- dis- anti- Antonyms pro- co- Share this Word Facebook WhatsApp X Telegram Copy Link