My sister is an English learner. In her English exam I noticed this sentence:
She just smiled ...... when her friends reminded of the day she slept in class. (EMBARRASS)
The answer given is embarrassedly
However, I couldn't find that word in online dictionaries such as Oxford, Cambridge or Longman, but I did see some examples of embarrassedly used in sentences. That's the same case with 'interestedly'
I'm so confused. Can I use embarrassingly instead?