Singularité

"The fundamental quality of one's voice, the phonetic patterns of speech, the speed and relative smoothness of articulations, the length and build of the sentences, the character and range of the words used, the readiness with which words respond to the requirements of the social environment, in particular the suitability of one's language to the language habits of the persons addressed - all these are so many complex indicators of the personality."

E. Sapir, Culture, Language and Personality