unforced

adjective
1
an unforced error is one that you make by playing badly, not because your opponent has caused you to make a mistake by playing well
اشتباه غیر اجباری, خطای غیر اجباری
2
natural; done without effort
طبیعی, بدون تلاش, بی زحمت, خودجوش
unforced humour