If you describe someone's words or ideas as gibberish, you mean that they do not make any sense. n-uncount
When he was talking to a girl he could hardly speak, and when he did speak he talked gibberish.
Translation English Cobuild Collins Dictionary
all Greek (informal) babble, balderdash, balls (taboo slang) bilge (informal) blather, bosh (informal) bull (slang) bullshit (taboo slang) bunkum or buncombe (chiefly U.S.) cobblers (Brit. taboo slang) crap (slang) double talk, drivel, eyewash (informal) gabble, garbage (informal) gobbledegook (informal) guff (slang) hogwash, hokum (slang, chiefly U.S. & Canad.) horsefeathers (U.S. slang) hot air (informal) jabber, jargon, moonshine, mumbo jumbo, nonsense, pap, piffle (informal) poppycock (informal) prattle, shit (taboo slang) tommyrot, tosh (slang, chiefly Brit.) tripe (informal) twaddle, yammer (informal)
English Collins Dictionary - English synonyms & Thesaurus
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