Intelligible Syndrome

"My apoligies but I cannot understand you.

— Intelligible Individual.

General

Intelligible is a somewhat negative colloquial term for those rare few who either cannot be understood through speech or are incapable of understanding others through hearing.
It appears they are unaffected by the Lingua Miasma along with its subsequent conditions such as the Redacted Filter and the Wandering accent syndrom.

— Excerpt from Conditions within Alézun'Teran.

Minor Intelligble

Some of the Intelligible are less affected than others, as these only have certain words -- such as individuals' names or verb terms -- that they cannot understand outright, though context usually helps to go around this problem.

— Excerpt from Conditions within Alézun'Teran.

Most affected

Mésvéstellians

None has so far managed to uncover how this condition affects people, and it is so rare very little knowledge about it has been assembled. Anyone could be affected, no matter their race, origin, or gender, though some studies have hinted that Mésvéstellian Humans and Vampires have marginal higher proportion of affected.

— Excerpt from Conditions within Alézun'Teran.

First-Generation Arrivals

It should be noted that this syndrome has only ever been shown within those who are First-Generation Arrivals, so it is a possibility it has something to do with one's metaphysical structure. Though persistent rumors go about of Second or even Third Generation Arrivals who have contracted it, though no concrete proof of this currently exist.

— Excerpt from Conditions within Alézun'Teran.

Alterantives

The Intelligible Sign Language

The most straightforward alternative that goes around this problem is the Intelligible Sign Language, or ISL as it is also called. A sign language explicitly created for the Intelligible so that they can make their voice heard, so to say.
While fully possible to learn it the old fashioned way, it is most often applied via XP Tablets. It is considered to be an integral language to learn if one wishes to apply for essential state-employed work, such as police, hospital personnel, and various bureaucratic positions.

— Excerpt from Conditions within Alézun'Teran.

Possible origin

Lingua Miasma.

Demonym

Intelligible.

Understood

Poorly.