Speak rapidly and unintelligibly, typically through fear or shock: they shrieked and gibbered as flames surrounded them (as adjective gibbering) a gibbering idiot
More example sentences
- Somehow, it left me almost gibbering with fear.
- By this stage I wasn't babbling, more like gibbering.
- The day will come, soon enough, when I'm gibbering, and incoherent, but right now I'm in control and I don't want anyone else to know.
early 17th century: imitative.
Entry from British & World English dictionary