gibberish Get Printable Handwriting (gib-ber-ish) 3 syllables Rhymes Learn It! Spelling Test Definition noun. rapid and incoherent talk; unintelligible chatter; jargon Example Sentence The baby just speaks gibberish. Synonyms jabber; unintelligible chatter; mumbo jumbo; nonsense Antonyms intelligent speech Rhymes Three Syllable Rhymes (1) gibberish Share with your friends: