The only 7-letter word that I can find that fits the description “nopen” is “nonplussed”.
Nonplussed means “to be surprised and confused, especially to the point of being speechless.” It is a relatively rare word, but it can be used in a variety of contexts. For example, you might say that you were nonplussed by a sudden change in plans, or that you were nonplussed by a difficult question.
Here are some other possible answers, but they are all less likely:
- pennons – a small flag or streamer, especially one attached to a lance or staff
- nonplus – the state of being nonplussed
- nonplusedness – the state of being nonplussed
- nonplussednesses – the plural of nonplussedness
I hope this helps!