unprompted
Definitions
Done or said without being asked, suggested, or prompted by another person.
Occurring spontaneously or without an external stimulus.
Examples
She gave me an unprompted hug when she saw how upset I was.
The student provided an unprompted explanation of the complex theory during the lecture.
Synonyms
spontaneous voluntary unsolicited impromptu unbidden automatic instinctive
Antonyms
prompted solicited forced compelled requested induced required