The opposite of casual remarks are formal statements. Formal statements are carefully thought out and delivered with precision. They might be prepared in advance in order to communicate an important piece of information or convey a specific message. While casual remarks carry a sense of informality and are often made without much thought, formal statements require an element of planning and preparation. They may be delivered in a more serious tone, and the speaker may take care to ensure that their language is clear, concise, and accurate. In many cases, formal statements are made in a more structured context, such as a presentation or meeting, rather than in a casual conversation.