"Endful" is a peculiar word that is rarely used in modern English. Its spelling is indeed unique, as it features the suffix "-ful" unpreceded by a complete word. Phonetically, "endful" is transcribed as /ˈɛndfəl/, in which the stress falls on the first syllable "end." This word is an archaic version of "endowed", meaning "gifted" or "blessed." Therefore, whilst being uncommon in everyday usage, "endful" is a word that indicates the qualities of a highly skilled or talented individual.