Here are some synonyms for unintelligible:
* Incomprehensible
* Indecipherable
* Meaningless
* Confused
* Mumbled
* Garbled
* Jumbled
Examples:
* "The speaker's accent was so thick that his speech was unintelligible."
* "The instructions were written in a completely unintelligible language."
* "The baby's cries were unintelligible, but we knew something was wrong."
It's important to note that "unintelligible" is often used to describe things that are difficult to understand due to:
* Language barriers: A foreign language or dialect might be unintelligible to someone who doesn't speak it.
* Poor communication: Mumbling, slurring words, or speaking too quickly can make someone unintelligible.
* Technical jargon: Specialized vocabulary in a particular field can be unintelligible to those outside of that field.
* Noise and distractions: Loud background noise or interruptions can make it difficult to understand what someone is saying.