unintelligible

unintelligible remarks; an unintelligible prose passage.

dolphin sounds are unintelligible to humans.

opaque rock crystals); figuratively it applies to something that is unintelligible:

The audio was unintelligible due to the poor connection.

His handwriting was so messy that it was almost unintelligible.

The foreign language was completely unintelligible to me.

The doctor's explanation was unintelligible to the patient.

The professor's handwriting on the board was unintelligible to most of the students.

The old manuscript was so faded that it became unintelligible.

The speech was delivered in such a rapid pace that it sounded unintelligible.

The technical jargon used in the manual was unintelligible to beginners.

The toddler's babbling was cute but unintelligible.

The cryptic message left by the spy was intentionally unintelligible.

The unintelligible stream of profanities started again.

You have a considerable talent for making things unintelligible, Minister.

The new boy articulated in a stammering voice an unintelligible name.

For example, American Sign Language and British Sign Language are mutually unintelligible.

To his daughter it was unintelligible, and he did not enlighten her.

From the earliest unintelligible babble to the emergence of a very first word.

It's notable I haven't heard a ton about election fraud (unintelligible).

With respect, Minister, how do you know it says the opposite if it's totally unintelligible?

He shook his head and muttered something unintelligible. I thought I picked out the word overreaction.

It is unintelligible, which is why 90% of taxpayers use an accountant or commercial software to file their returns.