wonder about (someone or something)
1. To have a strong curiosity about someone or something. Whenever I visit ancient structures like these, I can't help but wonder about how on earth people back then could have built them without the tools and knowledge we have now. People have been wondering for years about the enigmatic leader of the company.
2. To be doubtful or uncertain about someone or something. He seems genuine, but I have to wonder about his motivations, given what he has said in the past. If you're wondering about our new project manager, let me assure you that she is more than able for the job.
wonder about someone or something
to be curious or in doubt about someone or something. I wonder about Carl and what he is up to. Sometimes I wonder about life on other planets. Jenny's performance record made me wonder about her chances for success.
To be filled with curiosity or doubt about something or someone: I often wonder about the condition of the world. Do you ever wonder about the decision you made to quit school?