Correct spelling for the English word "Leful" is [lfˈʌl], [lfˈʌl], [l_f_ˈʌ_l] (IPA phonetic alphabet).
The word "Leful" originates from the Middle English term "lefulle" or "lefre", which can be traced back to the Old English word "lēof", meaning "dear" or "beloved". Over time, its meaning evolved to signify something lawful or permitted. The modern spelling, "leful", emerged in the early 14th century.