Which word suggests a sense of pressure or anxiety?

The word "fluster" conveys a sense of pressure or anxiety as it refers to a state of being agitated or confused, often due to stress or nervousness. When someone is flustered, they typically feel overwhelmed and struggle to think clearly, which is a direct manifestation of anxiety. This word encapsulates the turmoil that accompanies high-pressure situations, making it the best fit for the context of feeling pressured or anxious.

The other options do not share this meaning. "Flair" relates to a natural talent or ability, conveying a sense of ease or style rather than anxiety. "Foster" means to encourage or promote development, which is more about nurturing than about stress. "Forfeit" involves giving up something, often as a penalty, and while it can imply loss, it does not inherently involve feelings of pressure or anxiety.