Thesaurus.com
Dictionary.com
Definitions

gibberish

[jib-er-ish, gib-] / ˈdʒɪb ər ɪʃ, ˈgɪb- /
NOUN
nonsense talk
Synonyms
STRONGEST
babble drivel
STRONG
balderdash blather chatter claptrap gobbledygook hocus-pocus jabber jargon palaver prattle scat twaddle
WEAK
blah-blah double talk mumbo jumbo yammer
Antonyms
STRONGEST
sense

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.