Perplexity (noun)

1. A state of confusion, uncertainty, or doubt, especially as to what to do next or how to solve a problem.
2. A feeling of being puzzled or bewildered.

Origin:

The word 'perplexity' is derived from the latin word 'perplexus' meaning 'entangled' or 'bewildered'. it has been in use in english since the 16th century.

Examples:

1. The young student was filled with perplexity as he tried to solve the difficult math problem.
2. The witness's testimony left the jury in a state of perplexity, unable to determine the truth.
3. The tourists looked on in perplexity as they tried to figure out how to use the foreign public transportation system.
4. The scientist was faced with a perplexing problem, unable to determine the cause of the strange phenomenon.
5. The executive was filled with perplexity as he struggled to make a decision in the complex business matter.