Unforced (adjective)

Not made or done under duress or compulsion.

Origin:

From the prefix un- meaning not and the word forced.

Examples:

1. The unforced error cost the player the match.
2. He made an unforced admission of guilt.
3. She made an unforced decision to quit her job.
4. The unforced smile on her face was genuine.
5. The unforced pace of the game was comfortable for both teams.