While 'stoic' indicates control over emotions, it doesn't necessarily mean absence of feelings. Even though she was excited about the surprise party, she kept a stoic expression.
Pro Tip 2/3
Perception of Strength
'Stoic' often implies inner strength, as showing little reaction can be seen as a sign of fortitude. The stoic firefighter calmly saved lives, unaffected by the chaos around him.
Pro Tip 3/3
Not Unfeeling
Someone stoic isn't cold-hearted; they simply manage their reactions in a reserved way. Despite her stoic demeanor, she is very compassionate towards her students.