This is a common English shortened form, also seen in doubtful, needful, spoonful, and dutiful.
The adjective "beautiful" (literally "full of beauty") can only be spelled one way CORRECTLY in English. However, various imperfect spellings have been used to indicate accents and dialects, including the 4-syllable "be-yoo-tiful" that occasionally appears in cartoons and comic strips. The acronym version (B.U.T.-full) likewise has a 4-syllable pronunciation.
It is the most beautiful one on stage and mear
One word that begins with the suffix "full" is "beautiful."
minerals. There is only one "i".
Dandelion. There is only one "i".
The gerund is one word : fulfilling. (satisfying a need)
One. The only way to spell Chance is Chance.
There is only one correct way to spell "present."
temporarily. There is only one "o".
approximately. There is only one "t".
"sui generis"
psyche. There is only one "c".