Showing no emotional reaction.
keep it together
To maintain composure; to avoid an overly emotional reaction; to suppr…
bring a lump to someone's throat
To engender a strong emotional reaction.
knee-jerk reaction
An instantaneous reaction made without thought.
gut feeling
An instinct or intuition; an immediate or basic feeling or reaction wi…
in reaction
By being partially or entirely a response to a stimulus or other event…