"Casual" refers to something relaxed, informal, or not strict. The antonym "Formal" denotes something that is official, structured, or follows established conventions. Therefore, option (C) Formal is the opposite or antonym of "Casual."

"Agitate" means to disturb, excite, or make anxious. The opposite or antonym would be "Soothe," which means to calm or pacify. Therefore, option (D) Soothe is the most suitable antonym in this context.

"Praise" involves expressing approval or admiration, while "Condemn" involves expressing strong disapproval or criticism. Therefore, option (B) Condemn is the most suitable antonym in this context.

"Jaded" describes a state of weariness, fatigue, or lack of enthusiasm. The opposite of this would be feeling "refreshed," indicating a renewed and invigorated state. Therefore, option (B) refreshed is the most appropriate antonym in this context.

"Insatiable" refers to an inability to be satisfied or appeased. The opposite or antonym would be "Fulfilled," indicating a state of being satisfied or content. Therefore, option (B) Fulfilled is the most suitable antonym in this context.