The word "infractible" is not a commonly used term, but it can refer to something that is not easily broken or infringed upon. In terms of its spelling, it is pronounced /ɪnˈfræk.tə.bəl/ and is spelled with an "i" before the "n", not an "e" like some may assume. The second syllable is pronounced with a short "a" sound, followed by a stressed "t" and then a schwa sound before the final "b" and "l" sounds.