The spelling of the word "STOUTHRIEFF" may seem unusual and challenging, but it follows the rules of phonetics. "STOUTHRIEFF" is pronounced as /staʊθrɪf/ where each letter represents a specific sound. The "ou" letter combination creates the /aʊ/ diphthong sound, while the "th" sound is represented by the "th" digraph. "EIFF" at the end indicates that the suffix "-ive" is added, meaning "tending or inclined to." Therefore, "STOUTHRIEFF" means "tending or inclined to be resolute and determined."