Spontaneous
Definition 1 of 4
Pro Tip 1/2
Sudden Impression
Spontaneous event appears unplanned but might be pre-arranged to feel natural. His spontaneous speech won the crowd, though he rehearsed it for days.
Pro Tip 2/2
Not Coerced
A spontaneous act doesn't come from outside pressure, feels free and voluntary. She gave a spontaneous hug, not because she had to, but because she wanted to.