The term is soliloquy.
The adjective for such speech is "heartfelt." The person may be "earnest" or "sincere."
My Last Duchess is a dramatic monologue by Robert Browning. As monologue, only one person appears in the poem who speaks with himself. Being dramatic, it unfolds an excellent drama, bit by bit, without the aid of another character present, except the one who narrates the story.
A person who speaks French is called a francophone.
George Gallup has: Played Host in "America Speaks" in 1948. Played himself in "Person to Person" in 1953. Played himself in "The Twentieth Century" in 1957. Played himself in "Small World" in 1958. Played himself in "The Century of the Self" in 2002.
A person who speaks four languages is typically referred to as a quadrilingual or a polyglot. They have a high level of proficiency in four different languages.
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The literary technique is called "dramatic irony," when the audience knows more than the characters do. Dramatic irony is at work; it reveals that Oedipus often speaks rashly.
The cast of Freddy Speaks - 1992 includes: Wes Craven as himself Robert Englund as Himself - Host Robert Shaye as himself
The Christophers - 1952 Washington Speaks for Himself was released on: USA: 2 December 1956
An aside is a dramatic device where a character speaks directly to the audience or another character, revealing their inner thoughts or providing additional information. It is usually done quickly and is not heard by the other characters on stage.
A person who speaks a lot is often referred to as talkative or loquacious.
A person who speaks clearly is often referred to as articulate or eloquent.