absolutely trustworthy or sure: an infallible rule.
2.
unfailing in effectiveness or operation; certain: an infallible remedy.
3.
not fallible; exempt from liability to error, as persons, their judgment, or pronouncements: an infallible principle.
4.
Roman Catholic Church. immune from fallacy or liability to error in expounding matters of faith or morals by virtue of the promise made by Christ to the Church.
noun
5.
an infallible person or thing.
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In fallibleis always a great word to know.
So is callithumpian. Does it mean:
So is quincunx. Does it mean:
So is doohickey. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
a stew of meat, vegetables, potatoes, etc.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a gadget; dingus; thingumbob.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.