Interesting. I never noticed before, but you are correct, English speakers add an extra vowel in the middle compared to how it is spelled, and pronounce it with three syllables: fai-li-ur. Here are examples of people pronouncing it this way: https://www.youtube.com/watch?v=lO9K7VMFo2Y https://www.youtube.com/watch?v=fVIh1MFWDVw It seems to be the same in British and American dialects.

Yes. Actually the most notable difference between the two ways of pronouncing this word is the final sound: 'ure'. In British English (R.P. or S.S.B.E.) the last sound is a schwa - ˈfeɪljə (pronounced fay-li-yuh) compared with American English - ˈfeɪljər (pronounced fay-li-yerr) which ends with a rhotic 'r'. In British English words never end with a rhotic 'r' except when we're connecting the word with the next word beginning with a vowel. :)

Hello 👋 Every time, you have some doubts about pronunciation. You can look in the dictionary. I prefer to use the Cambridge dictionary. failure UK /ˈfeɪ.ljər/ US /ˈfeɪ.ljɚ/ If you open this word in this dictionary and listen to it, you can clearly hear that the difference between them is that the sound /r/ is much stronger in the American variant than in the British.