What does it mean to 'flounder'?

To 'flounder' means to behave awkwardly or to struggle clumsily, often in a physical or metaphorical sense. This term evokes an image of someone who is flailing or struggling to make progress, whether in a situation requiring skill or confidence. For example, a person floundering in a new job may be unsure of how to perform their tasks effectively, leading to awkward interactions and difficulty adapting.

The other options suggest successful, competent, or organized behavior, which is the opposite of what 'flounder' represents. The essence of 'flounder' lies in its connotation of struggle and awkwardness, making it the clear choice for this question.