spontaneous act
Definitions
An action performed as a result of a sudden inner impulse or inclination, rather than premeditation or external stimulus.
An unplanned or unprompted event occurring naturally without constraint or effort.
Examples
Buying flowers for his wife on a random Tuesday was a spontaneous act that truly brightened her day.
The decision to drive to the coast for the weekend was a spontaneous act of adventure that we will never forget.
Synonyms
impulsive gesture unplanned action spur of the moment deed instinctive move unpremeditated act
Antonyms
calculated move premeditated action planned endeavor deliberate choice rehearsed performance