Cluttered speech

Background
Cluttered speech is a common term for speech that becomes broken down, cluttered, or unintelligible due to a variety of reasons. Cluttered speech is often described as hurried, nervous, broken down, stuttering, stammering, and cluttering.

Stuttering
The common usage of stuttering is more similar to cluttered speech than to the speech disorder of stuttering. The common usage of stuttering refers to the nervous speech type of cluttered speech.

Nervous speech
People who don't have the speech disorder of stuttering will often mention they are "stuttering" in conjunction with the initial breakdown of a beginning of a speech. An example is, "I was so nervous that I could barely talk above a whisper. I stuttered, mispronounced words, and dropped a baby doll that I was using as a demo."

This nervous speech is the most common type of cluttered speech, because all people do it to a degree.

Public speaking
The Art of Public Speaking references cluttered speech as speech that is not clear and compelling, speech that forces listeners to "hack through a tangle of words to discover meaning."

Cluttered Speech Disorders
Cluttered speech happens as a part of various disorders which affect the speech.

Cluttering
The associated disorder resulting in an overage of cluttered speech is cluttering, in which speech becomes so cluttered that it becomes unintelligible, frequently through an overage of normal disfluencies such as repetitions, revisions, and interjections.

Fragile X Syndrome
Cluttered speech is a common symptom of Fragile X Syndrome. People with Fragile X with a higher IQ exhibit cluttered speech including disfluencies and stuttering

Pressured speech
Pressured speech is rapid, accelerated, frenzied speech that is a type of cluttered speech, which is typically associated with manias or hypomania.

Dyslexia
A symptom of dyslexia is the breakdown of speech, or cluttered speech.

Parkinson's
Michael J. Fox struggled with "cluttered speech" in conjunction with voice weakening due to Parkinson's. . He also said, "These impediments to self-expression are not the most painful or debilitating features of Parkinson's disease, yet they madden me more than even the most teeth-rattling full body tremor."