Flounder (verb)

1. To struggle or thrash about clumsily, especially in water.
2. To proceed clumsily or uncertainly, often in a difficult situation.
3. To be in a state of confusion or uncertainty; to falter or make mistakes.

Origin:

From middle english founder, meaning "to fall or sink.".

Examples:

1. The swimmer floundered in the rough waves, trying to stay afloat.
2. The student floundered during the exam, unable to answer the questions.
3. The company floundered for several years, before finally finding its footing.
4. The actor floundered on stage, forgetting his lines.
5. The politician floundered in the debate, unable to articulate their position clearly.