Answer: Downcast
Explanation:
According to the English dictionary, downcast in relation to the eyes means "looking downwards".
Looking downwards(avoiding eye contact) is often times a sign of fear, submission or guilt and sometimes a show of respect.
Downcast bests indicates that Mami is acting in a stern, serious way because looking downwards(avoiding eye contact) is a perfect body language response to someone that is acting serious and rigid.
The word that illustrates that Mami is acting in a stern, serious way is downcast.
The sentence given is "I listened to Mami's lecture with downcast eyes and the necessary, respectful expression of humility."
In this case, downcast in relation to the eyes means "looking downwards". This is important to show that Mami is acting in a stern, serious way is downcast.
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