babble incoherently

Translations
бормотать невнятно
He was so nervous that he started to babble incoherently.
Он был так нервен, что начал бормотать невнятно.
Definitions
To speak in a rapid and confused manner, often producing sounds or words that are difficult to understand or lack logical coherence.
Words
babble

verb
бормотать
incoherently

adverb
бессвязно