The word “beautiful” is pronounced with three syllables, with the stress on the second syllable. The first syllable is pronounced with a short “a” sound, like the “a” in “cat.” The second syllable is pronounced with a long “u” sound, like the “u” in “rude.” The third syllable is pronounced with a short “i” sound, like the “i” in “sit.”
There are a few common mispronunciations of the word “beautiful.” One is to pronounce the first syllable with a long “a” sound, like the “a” in “day.” Another is to pronounce the second syllable with a short “u” sound, like the “u” in “put.” Both of these mispronunciations are incorrect.