in·fal·li·ble/ɪn`fæləbḷ; ɪnˈfælɪbəl/ adj 1 something that is infallible always works correctly 〔事物〕肯定有效的，万无一失的: an infallible cure for hiccups 对付打嗝绝对有效的办法 2 someone who is infallible is never wrong 〔人〕永无过失的: Many small children believe their parents are infallible. 许多小孩相信自己的父母是不会犯错的。