What is the meaning of Pali word "Apannaka"

his question is based on the sutta translation of MN60. What is the Pali translation of “apannaka” https://suttacentral.net/mn60/en/sujato Ven. Sujato translate it as “guaranteed” Bhikkhu Bodi translate it as “incontrovertible truth” I.B Horner translate it as “the sure” Ven. Thanissaro translates it as “Safe Bet” When I read the Sutta, my understanding is that the meaning is very close to the word “safe bet” even though the gambling is very un Buddhist. Perhaps I would say “safe action”